/*  Prototype JavaScript framework, version 1.6.0.2
 *  (c) 2005-2008 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
    Version: '1.6.0.2',

    Browser: {
        IE:     !!(window.attachEvent && !window.opera),
        Opera:  !!window.opera,
        WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
        Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
        MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
    },

    BrowserFeatures: {
        XPath: !!document.evaluate,
        ElementExtensions: !!window.HTMLElement,
        SpecificElementExtensions:
            document.createElement('div').__proto__ &&
            document.createElement('div').__proto__ !==
            document.createElement('form').__proto__
    },

    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

    emptyFunction: function() { },
    K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
    Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
    create: function() {
        var parent = null, properties = $A(arguments);
        if (Object.isFunction(properties[0]))
            parent = properties.shift();

        function klass() {
            this.initialize.apply(this, arguments);
        }

        Object.extend(klass, Class.Methods);
        klass.superclass = parent;
        klass.subclasses = [];

        if (parent) {
            var subclass = function() { };
            subclass.prototype = parent.prototype;
            klass.prototype = new subclass;
            parent.subclasses.push(klass);
        }

        for (var i = 0; i < properties.length; i++)
            klass.addMethods(properties[i]);

        if (!klass.prototype.initialize)
            klass.prototype.initialize = Prototype.emptyFunction;

        klass.prototype.constructor = klass;

        return klass;
    }
};

Class.Methods = {
    addMethods: function(source) {
        var ancestor   = this.superclass && this.superclass.prototype;
        var properties = Object.keys(source);

        if (!Object.keys({ toString: true }).length)
            properties.push("toString", "valueOf");

        for (var i = 0, length = properties.length; i < length; i++) {
            var property = properties[i], value = source[property];
            if (ancestor && Object.isFunction(value) &&
                value.argumentNames().first() == "$super") {
                var method = value, value = Object.extend((function(m) {
                    return function() { return ancestor[m].apply(this, arguments) };
                })(property).wrap(method), {
                    valueOf:  function() { return method },
                    toString: function() { return method.toString() }
                });
            }
            this.prototype[property] = value;
        }

        return this;
    }
};

var Abstract = { };

Object.extend = function(destination, source) {
    for (var property in source)
        destination[property] = source[property];
    return destination;
};

Object.extend(Object, {
    inspect: function(object) {
        try {
            if (Object.isUndefined(object)) return 'undefined';
            if (object === null) return 'null';
            return object.inspect ? object.inspect() : String(object);
        } catch (e) {
            if (e instanceof RangeError) return '...';
            throw e;
        }
    },

    toJSON: function(object) {
        var type = typeof object;
        switch (type) {
            case 'undefined':
            case 'function':
            case 'unknown': return;
            case 'boolean': return object.toString();
        }

        if (object === null) return 'null';
        if (object.toJSON) return object.toJSON();
        if (Object.isElement(object)) return;

        var results = [];
        for (var property in object) {
            var value = Object.toJSON(object[property]);
            if (!Object.isUndefined(value))
                results.push(property.toJSON() + ': ' + value);
        }

        return '{' + results.join(', ') + '}';
    },

    toQueryString: function(object) {
        return $H(object).toQueryString();
    },

    toHTML: function(object) {
        return object && object.toHTML ? object.toHTML() : String.interpret(object);
    },

    keys: function(object) {
        var keys = [];
        for (var property in object)
            keys.push(property);
        return keys;
    },

    values: function(object) {
        var values = [];
        for (var property in object)
            values.push(object[property]);
        return values;
    },

    clone: function(object) {
        return Object.extend({ }, object);
    },

    isElement: function(object) {
        return object && object.nodeType == 1;
    },

    isArray: function(object) {
        return object != null && typeof object == "object" &&
            'splice' in object && 'join' in object;
    },

    isHash: function(object) {
        return object instanceof Hash;
    },

    isFunction: function(object) {
        return typeof object == "function";
    },

    isString: function(object) {
        return typeof object == "string";
    },

    isNumber: function(object) {
        return typeof object == "number";
    },

    isUndefined: function(object) {
        return typeof object == "undefined";
    }
});

Object.extend(Function.prototype, {
    argumentNames: function() {
        var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
        return names.length == 1 && !names[0] ? [] : names;
    },

    bind: function() {
        if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
        var __method = this, args = $A(arguments), object = args.shift();
        return function() {
            return __method.apply(object, args.concat($A(arguments)));
        }
    },

    bindAsEventListener: function() {
        var __method = this, args = $A(arguments), object = args.shift();
        return function(event) {
            return __method.apply(object, [event || window.event].concat(args));
        }
    },

    curry: function() {
        if (!arguments.length) return this;
        var __method = this, args = $A(arguments);
        return function() {
            return __method.apply(this, args.concat($A(arguments)));
        }
    },

    delay: function() {
        var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
        return window.setTimeout(function() {
            return __method.apply(__method, args);
        }, timeout);
    },

    wrap: function(wrapper) {
        var __method = this;
        return function() {
            return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
        }
    },

    methodize: function() {
        if (this._methodized) return this._methodized;
        var __method = this;
        return this._methodized = function() {
            return __method.apply(null, [this].concat($A(arguments)));
        };
    }
});

Function.prototype.defer = Function.prototype.delay.curry(0.01);

Date.prototype.toJSON = function() {
    return '"' + this.getUTCFullYear() + '-' +
        (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
        this.getUTCDate().toPaddedString(2) + 'T' +
        this.getUTCHours().toPaddedString(2) + ':' +
        this.getUTCMinutes().toPaddedString(2) + ':' +
        this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
    these: function() {
        var returnValue;

        for (var i = 0, length = arguments.length; i < length; i++) {
            var lambda = arguments[i];
            try {
                returnValue = lambda();
                break;
            } catch (e) { }
        }

        return returnValue;
    }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
    return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
    initialize: function(callback, frequency) {
        this.callback = callback;
        this.frequency = frequency;
        this.currentlyExecuting = false;

        this.registerCallback();
    },

    registerCallback: function() {
        this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    },

    execute: function() {
        this.callback(this);
    },

    stop: function() {
        if (!this.timer) return;
        clearInterval(this.timer);
        this.timer = null;
    },

    onTimerEvent: function() {
        if (!this.currentlyExecuting) {
            try {
                this.currentlyExecuting = true;
                this.execute();
            } finally {
                this.currentlyExecuting = false;
            }
        }
    }
});
Object.extend(String, {
    interpret: function(value) {
        return value == null ? '' : String(value);
    },
    specialChar: {
        '\b': '\\b',
        '\t': '\\t',
        '\n': '\\n',
        '\f': '\\f',
        '\r': '\\r',
        '\\': '\\\\'
    }
});

Object.extend(String.prototype, {
    gsub: function(pattern, replacement) {
        var result = '', source = this, match;
        replacement = arguments.callee.prepareReplacement(replacement);

        while (source.length > 0) {
            if (match = source.match(pattern)) {
                result += source.slice(0, match.index);
                result += String.interpret(replacement(match));
                source  = source.slice(match.index + match[0].length);
            } else {
                result += source, source = '';
            }
        }
        return result;
    },

    sub: function(pattern, replacement, count) {
        replacement = this.gsub.prepareReplacement(replacement);
        count = Object.isUndefined(count) ? 1 : count;

        return this.gsub(pattern, function(match) {
            if (--count < 0) return match[0];
            return replacement(match);
        });
    },

    scan: function(pattern, iterator) {
        this.gsub(pattern, iterator);
        return String(this);
    },

    truncate: function(length, truncation) {
        length = length || 30;
        truncation = Object.isUndefined(truncation) ? '...' : truncation;
        return this.length > length ?
            this.slice(0, length - truncation.length) + truncation : String(this);
    },

    strip: function() {
        return this.replace(/^\s+/, '').replace(/\s+$/, '');
    },

    stripTags: function() {
        return this.replace(/<\/?[^>]+>/gi, '');
    },

    stripScripts: function() {
        return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    },

    extractScripts: function() {
        var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
        var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
        return (this.match(matchAll) || []).map(function(scriptTag) {
            return (scriptTag.match(matchOne) || ['', ''])[1];
        });
    },

    evalScripts: function() {
        return this.extractScripts().map(function(script) { return eval(script) });
    },

    escapeHTML: function() {
        var self = arguments.callee;
        self.text.data = this;
        return self.div.innerHTML;
    },

    unescapeHTML: function() {
        var div = new Element('div');
        div.innerHTML = this.stripTags();
        return div.childNodes[0] ? (div.childNodes.length > 1 ?
            $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
            div.childNodes[0].nodeValue) : '';
    },

    toQueryParams: function(separator) {
        var match = this.strip().match(/([^?#]*)(#.*)?$/);
        if (!match) return { };

        return match[1].split(separator || '&').inject({ }, function(hash, pair) {
            if ((pair = pair.split('='))[0]) {
                var key = decodeURIComponent(pair.shift());
                var value = pair.length > 1 ? pair.join('=') : pair[0];
                if (value != undefined) value = decodeURIComponent(value);

                if (key in hash) {
                    if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
                    hash[key].push(value);
                }
                else hash[key] = value;
            }
            return hash;
        });
    },

    toArray: function() {
        return this.split('');
    },

    succ: function() {
        return this.slice(0, this.length - 1) +
            String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    },

    times: function(count) {
        return count < 1 ? '' : new Array(count + 1).join(this);
    },

    camelize: function() {
        var parts = this.split('-'), len = parts.length;
        if (len == 1) return parts[0];

        var camelized = this.charAt(0) == '-'
            ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
        : parts[0];

        for (var i = 1; i < len; i++)
            camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

        return camelized;
    },

    capitalize: function() {
        return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    },

    underscore: function() {
        return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
    },

    dasherize: function() {
        return this.gsub(/_/,'-');
    },

    inspect: function(useDoubleQuotes) {
        var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
            var character = String.specialChar[match[0]];
            return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
        });
        if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
        return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    },

    toJSON: function() {
        return this.inspect(true);
    },

    unfilterJSON: function(filter) {
        return this.sub(filter || Prototype.JSONFilter, '#{1}');
    },

    isJSON: function() {
        var str = this;
        if (str.blank()) return false;
        str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
        return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
    },

    evalJSON: function(sanitize) {
        var json = this.unfilterJSON();
        try {
            if (!sanitize || json.isJSON()) return eval('(' + json + ')');
        } catch (e) { }
        throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    },

    include: function(pattern) {
        return this.indexOf(pattern) > -1;
    },

    startsWith: function(pattern) {
        return this.indexOf(pattern) === 0;
    },

    endsWith: function(pattern) {
        var d = this.length - pattern.length;
        return d >= 0 && this.lastIndexOf(pattern) === d;
    },

    empty: function() {
        return this == '';
    },

    blank: function() {
        return /^\s*$/.test(this);
    },

    interpolate: function(object, pattern) {
        return new Template(this, pattern).evaluate(object);
    }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
    escapeHTML: function() {
        return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
    },
    unescapeHTML: function() {
        return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
    }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
    if (Object.isFunction(replacement)) return replacement;
    var template = new Template(replacement);
    return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
    div:  document.createElement('div'),
    text: document.createTextNode('')
});

with (String.prototype.escapeHTML) div.appendChild(text);

var Template = Class.create({
    initialize: function(template, pattern) {
        this.template = template.toString();
        this.pattern = pattern || Template.Pattern;
    },

    evaluate: function(object) {
        if (Object.isFunction(object.toTemplateReplacements))
            object = object.toTemplateReplacements();

        return this.template.gsub(this.pattern, function(match) {
            if (object == null) return '';

            var before = match[1] || '';
            if (before == '\\') return match[2];

            var ctx = object, expr = match[3];
            var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
            match = pattern.exec(expr);
            if (match == null) return before;

            while (match != null) {
                var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
                ctx = ctx[comp];
                if (null == ctx || '' == match[3]) break;
                expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
                match = pattern.exec(expr);
            }

            return before + String.interpret(ctx);
        });
    }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
    each: function(iterator, context) {
        var index = 0;
        iterator = iterator.bind(context);
        try {
            this._each(function(value) {
                iterator(value, index++);
            });
        } catch (e) {
            if (e != $break) throw e;
        }
        return this;
    },

    eachSlice: function(number, iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var index = -number, slices = [], array = this.toArray();
        while ((index += number) < array.length)
            slices.push(array.slice(index, index+number));
        return slices.collect(iterator, context);
    },

    all: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result = true;
        this.each(function(value, index) {
            result = result && !!iterator(value, index);
            if (!result) throw $break;
        });
        return result;
    },

    any: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result = false;
        this.each(function(value, index) {
            if (result = !!iterator(value, index))
                throw $break;
        });
        return result;
    },

    collect: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var results = [];
        this.each(function(value, index) {
            results.push(iterator(value, index));
        });
        return results;
    },

    detect: function(iterator, context) {
        iterator = iterator.bind(context);
        var result;
        this.each(function(value, index) {
            if (iterator(value, index)) {
                result = value;
                throw $break;
            }
        });
        return result;
    },

    findAll: function(iterator, context) {
        iterator = iterator.bind(context);
        var results = [];
        this.each(function(value, index) {
            if (iterator(value, index))
                results.push(value);
        });
        return results;
    },

    grep: function(filter, iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var results = [];

        if (Object.isString(filter))
            filter = new RegExp(filter);

        this.each(function(value, index) {
            if (filter.match(value))
                results.push(iterator(value, index));
        });
        return results;
    },

    include: function(object) {
        if (Object.isFunction(this.indexOf))
            if (this.indexOf(object) != -1) return true;

        var found = false;
        this.each(function(value) {
            if (value == object) {
                found = true;
                throw $break;
            }
        });
        return found;
    },

    inGroupsOf: function(number, fillWith) {
        fillWith = Object.isUndefined(fillWith) ? null : fillWith;
        return this.eachSlice(number, function(slice) {
            while(slice.length < number) slice.push(fillWith);
            return slice;
        });
    },

    inject: function(memo, iterator, context) {
        iterator = iterator.bind(context);
        this.each(function(value, index) {
            memo = iterator(memo, value, index);
        });
        return memo;
    },

    invoke: function(method) {
        var args = $A(arguments).slice(1);
        return this.map(function(value) {
            return value[method].apply(value, args);
        });
    },

    max: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator(value, index);
            if (result == null || value >= result)
                result = value;
        });
        return result;
    },

    min: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator(value, index);
            if (result == null || value < result)
                result = value;
        });
        return result;
    },

    partition: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var trues = [], falses = [];
        this.each(function(value, index) {
            (iterator(value, index) ?
                trues : falses).push(value);
        });
        return [trues, falses];
    },

    pluck: function(property) {
        var results = [];
        this.each(function(value) {
            results.push(value[property]);
        });
        return results;
    },

    reject: function(iterator, context) {
        iterator = iterator.bind(context);
        var results = [];
        this.each(function(value, index) {
            if (!iterator(value, index))
                results.push(value);
        });
        return results;
    },

    sortBy: function(iterator, context) {
        iterator = iterator.bind(context);
        return this.map(function(value, index) {
            return {value: value, criteria: iterator(value, index)};
        }).sort(function(left, right) {
            var a = left.criteria, b = right.criteria;
            return a < b ? -1 : a > b ? 1 : 0;
        }).pluck('value');
    },

    toArray: function() {
        return this.map();
    },

    zip: function() {
        var iterator = Prototype.K, args = $A(arguments);
        if (Object.isFunction(args.last()))
            iterator = args.pop();

        var collections = [this].concat(args).map($A);
        return this.map(function(value, index) {
            return iterator(collections.pluck(index));
        });
    },

    size: function() {
        return this.toArray().length;
    },

    inspect: function() {
        return '#<Enumerable:' + this.toArray().inspect() + '>';
    }
};

Object.extend(Enumerable, {
    map:     Enumerable.collect,
    find:    Enumerable.detect,
    select:  Enumerable.findAll,
    filter:  Enumerable.findAll,
    member:  Enumerable.include,
    entries: Enumerable.toArray,
    every:   Enumerable.all,
    some:    Enumerable.any
});
function $A(iterable) {
    if (!iterable) return [];
    if (iterable.toArray) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
}

if (Prototype.Browser.WebKit) {
    $A = function(iterable) {
        if (!iterable) return [];
        if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
            iterable.toArray) return iterable.toArray();
        var length = iterable.length || 0, results = new Array(length);
        while (length--) results[length] = iterable[length];
        return results;
    };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
    _each: function(iterator) {
        for (var i = 0, length = this.length; i < length; i++)
            iterator(this[i]);
    },

    clear: function() {
        this.length = 0;
        return this;
    },

    first: function() {
        return this[0];
    },

    last: function() {
        return this[this.length - 1];
    },

    compact: function() {
        return this.select(function(value) {
            return value != null;
        });
    },

    flatten: function() {
        return this.inject([], function(array, value) {
            return array.concat(Object.isArray(value) ?
                value.flatten() : [value]);
        });
    },

    without: function() {
        var values = $A(arguments);
        return this.select(function(value) {
            return !values.include(value);
        });
    },

    reverse: function(inline) {
        return (inline !== false ? this : this.toArray())._reverse();
    },

    reduce: function() {
        return this.length > 1 ? this : this[0];
    },

    uniq: function(sorted) {
        return this.inject([], function(array, value, index) {
            if (0 == index || (sorted ? array.last() != value : !array.include(value)))
                array.push(value);
            return array;
        });
    },

    intersect: function(array) {
        return this.uniq().findAll(function(item) {
            return array.detect(function(value) { return item === value });
        });
    },

    clone: function() {
        return [].concat(this);
    },

    size: function() {
        return this.length;
    },

    inspect: function() {
        return '[' + this.map(Object.inspect).join(', ') + ']';
    },

    toJSON: function() {
        var results = [];
        this.each(function(object) {
            var value = Object.toJSON(object);
            if (!Object.isUndefined(value)) results.push(value);
        });
        return '[' + results.join(', ') + ']';
    }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
    Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
    i || (i = 0);
    var length = this.length;
    if (i < 0) i = length + i;
    for (; i < length; i++)
        if (this[i] === item) return i;
    return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
    var n = this.slice(0, i).reverse().indexOf(item);
    return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
    if (!Object.isString(string)) return [];
    string = string.strip();
    return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
    Array.prototype.concat = function() {
        var array = [];
        for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
        for (var i = 0, length = arguments.length; i < length; i++) {
            if (Object.isArray(arguments[i])) {
                for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
                    array.push(arguments[i][j]);
            } else {
                array.push(arguments[i]);
            }
        }
        return array;
    };
}
Object.extend(Number.prototype, {
    toColorPart: function() {
        return this.toPaddedString(2, 16);
    },

    succ: function() {
        return this + 1;
    },

    times: function(iterator) {
        $R(0, this, true).each(iterator);
        return this;
    },

    toPaddedString: function(length, radix) {
        var string = this.toString(radix || 10);
        return '0'.times(length - string.length) + string;
    },

    toJSON: function() {
        return isFinite(this) ? this.toString() : 'null';
    }
});

$w('abs round ceil floor').each(function(method){
    Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
    return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

    function toQueryPair(key, value) {
        if (Object.isUndefined(value)) return key;
        return key + '=' + encodeURIComponent(String.interpret(value));
    }

    return {
        initialize: function(object) {
            this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
        },

        _each: function(iterator) {
            for (var key in this._object) {
                var value = this._object[key], pair = [key, value];
                pair.key = key;
                pair.value = value;
                iterator(pair);
            }
        },

        set: function(key, value) {
            return this._object[key] = value;
        },

        get: function(key) {
            return this._object[key];
        },

        unset: function(key) {
            var value = this._object[key];
            delete this._object[key];
            return value;
        },

        toObject: function() {
            return Object.clone(this._object);
        },

        keys: function() {
            return this.pluck('key');
        },

        values: function() {
            return this.pluck('value');
        },

        index: function(value) {
            var match = this.detect(function(pair) {
                return pair.value === value;
            });
            return match && match.key;
        },

        merge: function(object) {
            return this.clone().update(object);
        },

        update: function(object) {
            return new Hash(object).inject(this, function(result, pair) {
                result.set(pair.key, pair.value);
                return result;
            });
        },

        toQueryString: function() {
            return this.map(function(pair) {
                var key = encodeURIComponent(pair.key), values = pair.value;

                if (values && typeof values == 'object') {
                    if (Object.isArray(values))
                        return values.map(toQueryPair.curry(key)).join('&');
                }
                return toQueryPair(key, values);
            }).join('&');
        },

        inspect: function() {
            return '#<Hash:{' + this.map(function(pair) {
                return pair.map(Object.inspect).join(': ');
            }).join(', ') + '}>';
        },

        toJSON: function() {
            return Object.toJSON(this.toObject());
        },

        clone: function() {
            return new Hash(this);
        }
    }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
    initialize: function(start, end, exclusive) {
        this.start = start;
        this.end = end;
        this.exclusive = exclusive;
    },

    _each: function(iterator) {
        var value = this.start;
        while (this.include(value)) {
            iterator(value);
            value = value.succ();
        }
    },

    include: function(value) {
        if (value < this.start)
            return false;
        if (this.exclusive)
            return value < this.end;
        return value <= this.end;
    }
});

var $R = function(start, end, exclusive) {
    return new ObjectRange(start, end, exclusive);
};

var Ajax = {
    getTransport: function() {
        return Try.these(
        function() {return new XMLHttpRequest()},
        function() {return new ActiveXObject('Msxml2.XMLHTTP')},
        function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
    },

    activeRequestCount: 0
};

Ajax.Responders = {
    responders: [],

    _each: function(iterator) {
        this.responders._each(iterator);
    },

    register: function(responder) {
        if (!this.include(responder))
            this.responders.push(responder);
    },

    unregister: function(responder) {
        this.responders = this.responders.without(responder);
    },

    dispatch: function(callback, request, transport, json) {
        this.each(function(responder) {
            if (Object.isFunction(responder[callback])) {
                try {
                    responder[callback].apply(responder, [request, transport, json]);
                } catch (e) { }
            }
        });
    }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
    onCreate:   function() { Ajax.activeRequestCount++ },
    onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
    initialize: function(options) {
        this.options = {
            method:       'post',
            asynchronous: true,
            contentType:  'application/x-www-form-urlencoded',
            encoding:     'UTF-8',
            parameters:   '',
            evalJSON:     true,
            evalJS:       true
        };
        Object.extend(this.options, options || { });

        this.options.method = this.options.method.toLowerCase();

        if (Object.isString(this.options.parameters))
            this.options.parameters = this.options.parameters.toQueryParams();
        else if (Object.isHash(this.options.parameters))
            this.options.parameters = this.options.parameters.toObject();
    }
});

Ajax.Request = Class.create(Ajax.Base, {
    _complete: false,

    initialize: function($super, url, options) {
        $super(options);
        this.transport = Ajax.getTransport();
        this.request(url);
    },

    request: function(url) {
        this.url = url;
        this.method = this.options.method;
        var params = Object.clone(this.options.parameters);

        if (!['get', 'post'].include(this.method)) {
            // simulate other verbs over post
            params['_method'] = this.method;
            this.method = 'post';
        }

        this.parameters = params;

        if (params = Object.toQueryString(params)) {
            // when GET, append parameters to URL
            if (this.method == 'get')
                this.url += (this.url.include('?') ? '&' : '?') + params;
            else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
                params += '&_=';
        }

        try {
            var response = new Ajax.Response(this);
            if (this.options.onCreate) this.options.onCreate(response);
            Ajax.Responders.dispatch('onCreate', this, response);

            this.transport.open(this.method.toUpperCase(), this.url,
            this.options.asynchronous);

            if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

            this.transport.onreadystatechange = this.onStateChange.bind(this);
            this.setRequestHeaders();

            this.body = this.method == 'post' ? (this.options.postBody || params) : null;
            this.transport.send(this.body);

            /* Force Firefox to handle ready state 4 for synchronous requests */
            if (!this.options.asynchronous && this.transport.overrideMimeType)
                this.onStateChange();

        }
        catch (e) {
            this.dispatchException(e);
        }
    },

    onStateChange: function() {
        var readyState = this.transport.readyState;
        if (readyState > 1 && !((readyState == 4) && this._complete))
            this.respondToReadyState(this.transport.readyState);
    },

    setRequestHeaders: function() {
        var headers = {
            'X-Requested-With': 'XMLHttpRequest',
            'X-Prototype-Version': Prototype.Version,
            'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
        };

        if (this.method == 'post') {
            headers['Content-type'] = this.options.contentType +
                (this.options.encoding ? '; charset=' + this.options.encoding : '');

            /* Force "Connection: close" for older Mozilla browsers to work
             * around a bug where XMLHttpRequest sends an incorrect
             * Content-length header. See Mozilla Bugzilla #246651.
             */
            if (this.transport.overrideMimeType &&
                (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
                headers['Connection'] = 'close';
        }

        // user-defined headers
        if (typeof this.options.requestHeaders == 'object') {
            var extras = this.options.requestHeaders;

            if (Object.isFunction(extras.push))
                for (var i = 0, length = extras.length; i < length; i += 2)
                    headers[extras[i]] = extras[i+1];
            else
                $H(extras).each(function(pair) { headers[pair.key] = pair.value });
        }

        for (var name in headers)
            this.transport.setRequestHeader(name, headers[name]);
    },

    success: function() {
        var status = this.getStatus();
        return !status || (status >= 200 && status < 300);
    },

    getStatus: function() {
        try {
            return this.transport.status || 0;
        } catch (e) { return 0 }
    },

    respondToReadyState: function(readyState) {
        var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

        if (state == 'Complete') {
            try {
                this._complete = true;
                (this.options['on' + response.status]
                    || this.options['on' + (this.success() ? 'Success' : 'Failure')]
                    || Prototype.emptyFunction)(response, response.headerJSON);
            } catch (e) {
                this.dispatchException(e);
            }

            var contentType = response.getHeader('Content-type');
            if (this.options.evalJS == 'force'
                || (this.options.evalJS && this.isSameOrigin() && contentType
                && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
                this.evalResponse();
        }

        try {
            (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
            Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
        } catch (e) {
            this.dispatchException(e);
        }

        if (state == 'Complete') {
            // avoid memory leak in MSIE: clean up
            this.transport.onreadystatechange = Prototype.emptyFunction;
        }
    },

    isSameOrigin: function() {
        var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
        return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
            protocol: location.protocol,
            domain: document.domain,
            port: location.port ? ':' + location.port : ''
        }));
    },

    getHeader: function(name) {
        try {
            return this.transport.getResponseHeader(name) || null;
        } catch (e) { return null }
    },

    evalResponse: function() {
        try {
            return eval((this.transport.responseText || '').unfilterJSON());
        } catch (e) {
            this.dispatchException(e);
        }
    },

    dispatchException: function(exception) {
        (this.options.onException || Prototype.emptyFunction)(this, exception);
        Ajax.Responders.dispatch('onException', this, exception);
    }
});

Ajax.Request.Events =
    ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
    initialize: function(request){
        this.request = request;
        var transport  = this.transport  = request.transport,
        readyState = this.readyState = transport.readyState;

        if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
            this.status       = this.getStatus();
            this.statusText   = this.getStatusText();
            this.responseText = String.interpret(transport.responseText);
            this.headerJSON   = this._getHeaderJSON();
        }

        if(readyState == 4) {
            var xml = transport.responseXML;
            this.responseXML  = Object.isUndefined(xml) ? null : xml;
            this.responseJSON = this._getResponseJSON();
        }
    },

    status:      0,
    statusText: '',

    getStatus: Ajax.Request.prototype.getStatus,

    getStatusText: function() {
        try {
            return this.transport.statusText || '';
        } catch (e) { return '' }
    },

    getHeader: Ajax.Request.prototype.getHeader,

    getAllHeaders: function() {
        try {
            return this.getAllResponseHeaders();
        } catch (e) { return null }
    },

    getResponseHeader: function(name) {
        return this.transport.getResponseHeader(name);
    },

    getAllResponseHeaders: function() {
        return this.transport.getAllResponseHeaders();
    },

    _getHeaderJSON: function() {
        var json = this.getHeader('X-JSON');
        if (!json) return null;
        json = decodeURIComponent(escape(json));
        try {
            return json.evalJSON(this.request.options.sanitizeJSON ||
                !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    },

    _getResponseJSON: function() {
        var options = this.request.options;
        if (!options.evalJSON || (options.evalJSON != 'force' &&
            !(this.getHeader('Content-type') || '').include('application/json')) ||
            this.responseText.blank())
            return null;
        try {
            return this.responseText.evalJSON(options.sanitizeJSON ||
                !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    }
});

Ajax.Updater = Class.create(Ajax.Request, {
    initialize: function($super, container, url, options) {
        this.container = {
            success: (container.success || container),
            failure: (container.failure || (container.success ? null : container))
        };

        options = Object.clone(options);
        var onComplete = options.onComplete;
        options.onComplete = (function(response, json) {
            this.updateContent(response.responseText);
            if (Object.isFunction(onComplete)) onComplete(response, json);
        }).bind(this);

        $super(url, options);
    },

    updateContent: function(responseText) {
        var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

        if (!options.evalScripts) responseText = responseText.stripScripts();

        if (receiver = $(receiver)) {
            if (options.insertion) {
                if (Object.isString(options.insertion)) {
                    var insertion = { }; insertion[options.insertion] = responseText;
                    receiver.insert(insertion);
                }
                else options.insertion(receiver, responseText);
            }
            else receiver.update(responseText);
        }
    }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
    initialize: function($super, container, url, options) {
        $super(options);
        this.onComplete = this.options.onComplete;

        this.frequency = (this.options.frequency || 2);
        this.decay = (this.options.decay || 1);

        this.updater = { };
        this.container = container;
        this.url = url;

        this.start();
    },

    start: function() {
        this.options.onComplete = this.updateComplete.bind(this);
        this.onTimerEvent();
    },

    stop: function() {
        this.updater.options.onComplete = undefined;
        clearTimeout(this.timer);
        (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
    },

    updateComplete: function(response) {
        if (this.options.decay) {
            this.decay = (response.responseText == this.lastText ?
                this.decay * this.options.decay : 1);

            this.lastText = response.responseText;
        }
        this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
    },

    onTimerEvent: function() {
        this.updater = new Ajax.Updater(this.container, this.url, this.options);
    }
});
function $(element) {
    if (arguments.length > 1) {
        for (var i = 0, elements = [], length = arguments.length; i < length; i++)
            elements.push($(arguments[i]));
        return elements;
    }
    if (Object.isString(element))
        element = document.getElementById(element);
    return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
    document._getElementsByXPath = function(expression, parentElement) {
        var results = [];
        var query = document.evaluate(expression, $(parentElement) || document,
        null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        for (var i = 0, length = query.snapshotLength; i < length; i++)
            results.push(Element.extend(query.snapshotItem(i)));
        return results;
    };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
    // DOM level 2 ECMAScript Language Binding
    Object.extend(Node, {
        ELEMENT_NODE: 1,
        ATTRIBUTE_NODE: 2,
        TEXT_NODE: 3,
        CDATA_SECTION_NODE: 4,
        ENTITY_REFERENCE_NODE: 5,
        ENTITY_NODE: 6,
        PROCESSING_INSTRUCTION_NODE: 7,
        COMMENT_NODE: 8,
        DOCUMENT_NODE: 9,
        DOCUMENT_TYPE_NODE: 10,
        DOCUMENT_FRAGMENT_NODE: 11,
        NOTATION_NODE: 12
    });
}

(function() {
    var element = this.Element;
    this.Element = function(tagName, attributes) {
        attributes = attributes || { };
        tagName = tagName.toLowerCase();
        var cache = Element.cache;
        if (Prototype.Browser.IE && attributes.name) {
            tagName = '<' + tagName + ' name="' + attributes.name + '">';
            delete attributes.name;
            return Element.writeAttribute(document.createElement(tagName), attributes);
        }
        if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
        return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
    };
    Object.extend(this.Element, element || { });
}).call(window);

Element.cache = { };

Element.Methods = {
    visible: function(element) {
        return $(element).style.display != 'none';
    },

    toggle: function(element) {
        element = $(element);
        Element[Element.visible(element) ? 'hide' : 'show'](element);
        return element;
    },

    hide: function(element) {
        $(element).style.display = 'none';
        return element;
    },

    show: function(element) {
        $(element).style.display = '';
        return element;
    },

    remove: function(element) {
        element = $(element);
        element.parentNode.removeChild(element);
        return element;
    },

    update: function(element, content) {
        element = $(element);
        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) return element.update().insert(content);
        content = Object.toHTML(content);
        element.innerHTML = content.stripScripts();
        content.evalScripts.bind(content).defer();
        return element;
    },

    replace: function(element, content) {
        element = $(element);
        if (content && content.toElement) content = content.toElement();
        else if (!Object.isElement(content)) {
            content = Object.toHTML(content);
            var range = element.ownerDocument.createRange();
            range.selectNode(element);
            content.evalScripts.bind(content).defer();
            content = range.createContextualFragment(content.stripScripts());
        }
        element.parentNode.replaceChild(content, element);
        return element;
    },

    insert: function(element, insertions) {
        element = $(element);

        if (Object.isString(insertions) || Object.isNumber(insertions) ||
            Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
            insertions = {bottom:insertions};

        var content, insert, tagName, childNodes;

        for (var position in insertions) {
            content  = insertions[position];
            position = position.toLowerCase();
            insert = Element._insertionTranslations[position];

            if (content && content.toElement) content = content.toElement();
            if (Object.isElement(content)) {
                insert(element, content);
                continue;
            }

            content = Object.toHTML(content);

            tagName = ((position == 'before' || position == 'after')
                ? element.parentNode : element).tagName.toUpperCase();

            childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

            if (position == 'top' || position == 'after') childNodes.reverse();
            childNodes.each(insert.curry(element));

            content.evalScripts.bind(content).defer();
        }

        return element;
    },

    wrap: function(element, wrapper, attributes) {
        element = $(element);
        if (Object.isElement(wrapper))
            $(wrapper).writeAttribute(attributes || { });
        else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
        else wrapper = new Element('div', wrapper);
        if (element.parentNode)
            element.parentNode.replaceChild(wrapper, element);
        wrapper.appendChild(element);
        return wrapper;
    },

    inspect: function(element) {
        element = $(element);
        var result = '<' + element.tagName.toLowerCase();
        $H({'id': 'id', 'className': 'class'}).each(function(pair) {
            var property = pair.first(), attribute = pair.last();
            var value = (element[property] || '').toString();
            if (value) result += ' ' + attribute + '=' + value.inspect(true);
        });
        return result + '>';
    },

    recursivelyCollect: function(element, property) {
        element = $(element);
        var elements = [];
        while (element = element[property])
            if (element.nodeType == 1)
                elements.push(Element.extend(element));
        return elements;
    },

    ancestors: function(element) {
        return $(element).recursivelyCollect('parentNode');
    },

    descendants: function(element) {
        return $(element).select("*");
    },

    firstDescendant: function(element) {
        element = $(element).firstChild;
        while (element && element.nodeType != 1) element = element.nextSibling;
        return $(element);
    },

    immediateDescendants: function(element) {
        if (!(element = $(element).firstChild)) return [];
        while (element && element.nodeType != 1) element = element.nextSibling;
        if (element) return [element].concat($(element).nextSiblings());
        return [];
    },

    previousSiblings: function(element) {
        return $(element).recursivelyCollect('previousSibling');
    },

    nextSiblings: function(element) {
        return $(element).recursivelyCollect('nextSibling');
    },

    siblings: function(element) {
        element = $(element);
        return element.previousSiblings().reverse().concat(element.nextSiblings());
    },

    match: function(element, selector) {
        if (Object.isString(selector))
            selector = new Selector(selector);
        return selector.match($(element));
    },

    up: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return $(element.parentNode);
        var ancestors = element.ancestors();
        return Object.isNumber(expression) ? ancestors[expression] :
            Selector.findElement(ancestors, expression, index);
    },

    down: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return element.firstDescendant();
        return Object.isNumber(expression) ? element.descendants()[expression] :
            element.select(expression)[index || 0];
    },

    previous: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
        var previousSiblings = element.previousSiblings();
        return Object.isNumber(expression) ? previousSiblings[expression] :
            Selector.findElement(previousSiblings, expression, index);
    },

    next: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
        var nextSiblings = element.nextSiblings();
        return Object.isNumber(expression) ? nextSiblings[expression] :
            Selector.findElement(nextSiblings, expression, index);
    },

    select: function() {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element, args);
    },

    adjacent: function() {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element.parentNode, args).without(element);
    },

    identify: function(element) {
        element = $(element);
        var id = element.readAttribute('id'), self = arguments.callee;
        if (id) return id;
        do { id = 'anonymous_element_' + self.counter++ } while ($(id));
        element.writeAttribute('id', id);
        return id;
    },

    readAttribute: function(element, name) {
        element = $(element);
        if (Prototype.Browser.IE) {
            var t = Element._attributeTranslations.read;
            if (t.values[name]) return t.values[name](element, name);
            if (t.names[name]) name = t.names[name];
            if (name.include(':')) {
                return (!element.attributes || !element.attributes[name]) ? null :
                    element.attributes[name].value;
            }
        }
        return element.getAttribute(name);
    },

    writeAttribute: function(element, name, value) {
        element = $(element);
        var attributes = { }, t = Element._attributeTranslations.write;

        if (typeof name == 'object') attributes = name;
        else attributes[name] = Object.isUndefined(value) ? true : value;

        for (var attr in attributes) {
            name = t.names[attr] || attr;
            value = attributes[attr];
            if (t.values[attr]) name = t.values[attr](element, value);
            if (value === false || value === null)
                element.removeAttribute(name);
            else if (value === true)
                element.setAttribute(name, name);
            else element.setAttribute(name, value);
        }
        return element;
    },

    getHeight: function(element) {
        return $(element).getDimensions().height;
    },

    getWidth: function(element) {
        return $(element).getDimensions().width;
    },

    classNames: function(element) {
        return new Element.ClassNames(element);
    },

    hasClassName: function(element, className) {
        if (!(element = $(element))) return;
        var elementClassName = element.className;
        return (elementClassName.length > 0 && (elementClassName == className ||
            new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
    },

    addClassName: function(element, className) {
        if (!(element = $(element))) return;
        if (!element.hasClassName(className))
            element.className += (element.className ? ' ' : '') + className;
        return element;
    },

    removeClassName: function(element, className) {
        if (!(element = $(element))) return;
        element.className = element.className.replace(
        new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
        return element;
    },

    toggleClassName: function(element, className) {
        if (!(element = $(element))) return;
        return element[element.hasClassName(className) ?
                'removeClassName' : 'addClassName'](className);
    },

    // removes whitespace-only text node children
    cleanWhitespace: function(element) {
        element = $(element);
        var node = element.firstChild;
        while (node) {
            var nextNode = node.nextSibling;
            if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
                element.removeChild(node);
            node = nextNode;
        }
        return element;
    },

    empty: function(element) {
        return $(element).innerHTML.blank();
    },

    descendantOf: function(element, ancestor) {
        element = $(element), ancestor = $(ancestor);
        var originalAncestor = ancestor;

        if (element.compareDocumentPosition)
            return (element.compareDocumentPosition(ancestor) & 8) === 8;

        if (element.sourceIndex && !Prototype.Browser.Opera) {
            var e = element.sourceIndex, a = ancestor.sourceIndex,
            nextAncestor = ancestor.nextSibling;
            if (!nextAncestor) {
                do { ancestor = ancestor.parentNode; }
                while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
            }
            if (nextAncestor && nextAncestor.sourceIndex)
                return (e > a && e < nextAncestor.sourceIndex);
        }

        while (element = element.parentNode)
            if (element == originalAncestor) return true;
        return false;
    },

    scrollTo: function(element) {
        element = $(element);
        var pos = element.cumulativeOffset();
        window.scrollTo(pos[0], pos[1]);
        return element;
    },

    getStyle: function(element, style) {
        element = $(element);
        style = style == 'float' ? 'cssFloat' : style.camelize();
        var value = element.style[style];
        if (!value) {
            var css = document.defaultView.getComputedStyle(element, null);
            value = css ? css[style] : null;
        }
        if (style == 'opacity') return value ? parseFloat(value) : 1.0;
        return value == 'auto' ? null : value;
    },

    getOpacity: function(element) {
        return $(element).getStyle('opacity');
    },

    setStyle: function(element, styles) {
        element = $(element);
        var elementStyle = element.style, match;
        if (Object.isString(styles)) {
            element.style.cssText += ';' + styles;
            return styles.include('opacity') ?
                element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
        }
        for (var property in styles)
            if (property == 'opacity') element.setOpacity(styles[property]);
        else
            elementStyle[(property == 'float' || property == 'cssFloat') ?
                    (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
                    property] = styles[property];

        return element;
    },

    setOpacity: function(element, value) {
        element = $(element);
        element.style.opacity = (value == 1 || value === '') ? '' :
            (value < 0.00001) ? 0 : value;
        return element;
    },

    getDimensions: function(element) {
        element = $(element);
        var display = $(element).getStyle('display');
        if (display != 'none' && display != null) // Safari bug
            return {width: element.offsetWidth, height: element.offsetHeight};

        // All *Width and *Height properties give 0 on elements with display none,
        // so enable the element temporarily
        var els = element.style;
        var originalVisibility = els.visibility;
        var originalPosition = els.position;
        var originalDisplay = els.display;
        els.visibility = 'hidden';
        els.position = 'absolute';
        els.display = 'block';
        var originalWidth = element.clientWidth;
        var originalHeight = element.clientHeight;
        els.display = originalDisplay;
        els.position = originalPosition;
        els.visibility = originalVisibility;
        return {width: originalWidth, height: originalHeight};
    },

    makePositioned: function(element) {
        element = $(element);
        var pos = Element.getStyle(element, 'position');
        if (pos == 'static' || !pos) {
            element._madePositioned = true;
            element.style.position = 'relative';
            // Opera returns the offset relative to the positioning context, when an
            // element is position relative but top and left have not been defined
            if (window.opera) {
                element.style.top = 0;
                element.style.left = 0;
            }
        }
        return element;
    },

    undoPositioned: function(element) {
        element = $(element);
        if (element._madePositioned) {
            element._madePositioned = undefined;
            element.style.position =
                element.style.top =
                element.style.left =
                element.style.bottom =
                element.style.right = '';
        }
        return element;
    },

    makeClipping: function(element) {
        element = $(element);
        if (element._overflow) return element;
        element._overflow = Element.getStyle(element, 'overflow') || 'auto';
        if (element._overflow !== 'hidden')
            element.style.overflow = 'hidden';
        return element;
    },

    undoClipping: function(element) {
        element = $(element);
        if (!element._overflow) return element;
        element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
        element._overflow = null;
        return element;
    },

    cumulativeOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
        } while (element);
        return Element._returnOffset(valueL, valueT);
    },

    positionedOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
            if (element) {
                if (element.tagName == 'BODY') break;
                var p = Element.getStyle(element, 'position');
                if (p !== 'static') break;
            }
        } while (element);
        return Element._returnOffset(valueL, valueT);
    },

    absolutize: function(element) {
        element = $(element);
        if (element.getStyle('position') == 'absolute') return;
        // Position.prepare(); // To be done manually by Scripty when it needs it.

        var offsets = element.positionedOffset();
        var top     = offsets[1];
        var left    = offsets[0];
        var width   = element.clientWidth;
        var height  = element.clientHeight;

        element._originalLeft   = left - parseFloat(element.style.left  || 0);
        element._originalTop    = top  - parseFloat(element.style.top || 0);
        element._originalWidth  = element.style.width;
        element._originalHeight = element.style.height;

        element.style.position = 'absolute';
        element.style.top    = top + 'px';
        element.style.left   = left + 'px';
        element.style.width  = width + 'px';
        element.style.height = height + 'px';
        return element;
    },

    relativize: function(element) {
        element = $(element);
        if (element.getStyle('position') == 'relative') return;
        // Position.prepare(); // To be done manually by Scripty when it needs it.

        element.style.position = 'relative';
        var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
        var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

        element.style.top    = top + 'px';
        element.style.left   = left + 'px';
        element.style.height = element._originalHeight;
        element.style.width  = element._originalWidth;
        return element;
    },

    cumulativeScrollOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.scrollTop  || 0;
            valueL += element.scrollLeft || 0;
            element = element.parentNode;
        } while (element);
        return Element._returnOffset(valueL, valueT);
    },

    getOffsetParent: function(element) {
        if (element.offsetParent) return $(element.offsetParent);
        if (element == document.body) return $(element);

        while ((element = element.parentNode) && element != document.body)
            if (Element.getStyle(element, 'position') != 'static')
                return $(element);

        return $(document.body);
    },

    viewportOffset: function(forElement) {
        var valueT = 0, valueL = 0;

        var element = forElement;
        do {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;

            // Safari fix
            if (element.offsetParent == document.body &&
                Element.getStyle(element, 'position') == 'absolute') break;

        } while (element = element.offsetParent);

        element = forElement;
        do {
            if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
                valueT -= element.scrollTop  || 0;
                valueL -= element.scrollLeft || 0;
            }
        } while (element = element.parentNode);

        return Element._returnOffset(valueL, valueT);
    },

    clonePosition: function(element, source) {
        var options = Object.extend({
            setLeft:    true,
            setTop:     true,
            setWidth:   true,
            setHeight:  true,
            offsetTop:  0,
            offsetLeft: 0
        }, arguments[2] || { });

        // find page position of source
        source = $(source);
        var p = source.viewportOffset();

        // find coordinate system to use
        element = $(element);
        var delta = [0, 0];
        var parent = null;
        // delta [0,0] will do fine with position: fixed elements,
        // position:absolute needs offsetParent deltas
        if (Element.getStyle(element, 'position') == 'absolute') {
            parent = element.getOffsetParent();
            delta = parent.viewportOffset();
        }

        // correct by body offsets (fixes Safari)
        if (parent == document.body) {
            delta[0] -= document.body.offsetLeft;
            delta[1] -= document.body.offsetTop;
        }

        // set position
        if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
        if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
        if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
        if (options.setHeight) element.style.height = source.offsetHeight + 'px';
        return element;
    }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
    getElementsBySelector: Element.Methods.select,
    childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
    write: {
        names: {
            className: 'class',
            htmlFor:   'for'
        },
        values: { }
    }
};

if (Prototype.Browser.Opera) {
    Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
        switch (style) {
            case 'left': case 'top': case 'right': case 'bottom':
                            if (proceed(element, 'position') === 'static') return null;
                        case 'height': case 'width':
                                // returns '0px' for hidden elements; we want it to return null
                                if (!Element.visible(element)) return null;

                                // returns the border-box dimensions rather than the content-box
                                // dimensions, so we subtract padding and borders from the value
                                var dim = parseInt(proceed(element, style), 10);

                                if (dim !== element['offset' + style.capitalize()])
                                    return dim + 'px';

                                var properties;
                                if (style === 'height') {
                                    properties = ['border-top-width', 'padding-top',
                                        'padding-bottom', 'border-bottom-width'];
                                }
                                else {
                                    properties = ['border-left-width', 'padding-left',
                                        'padding-right', 'border-right-width'];
                                }
                                return properties.inject(dim, function(memo, property) {
                                    var val = proceed(element, property);
                                    return val === null ? memo : memo - parseInt(val, 10);
                                }) + 'px';
                            default: return proceed(element, style);
                        }
                    }
                );

                    Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
                    function(proceed, element, attribute) {
                        if (attribute === 'title') return element.title;
                        return proceed(element, attribute);
                    }
                );
                }

                else if (Prototype.Browser.IE) {
                    // IE doesn't report offsets correctly for static elements, so we change them
                    // to "relative" to get the values, then change them back.
                    Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
                    function(proceed, element) {
                        element = $(element);
                        var position = element.getStyle('position');
                        if (position !== 'static') return proceed(element);
                        element.setStyle({ position: 'relative' });
                        var value = proceed(element);
                        element.setStyle({ position: position });
                        return value;
                    }
                );

                    $w('positionedOffset viewportOffset').each(function(method) {
                        Element.Methods[method] = Element.Methods[method].wrap(
                        function(proceed, element) {
                            element = $(element);
                            var position = element.getStyle('position');
                            if (position !== 'static') return proceed(element);
                            // Trigger hasLayout on the offset parent so that IE6 reports
                            // accurate offsetTop and offsetLeft values for position: fixed.
                            var offsetParent = element.getOffsetParent();
                            if (offsetParent && offsetParent.getStyle('position') === 'fixed')
                                offsetParent.setStyle({ zoom: 1 });
                            element.setStyle({ position: 'relative' });
                            var value = proceed(element);
                            element.setStyle({ position: position });
                            return value;
                        }
                    );
                    });

                    Element.Methods.getStyle = function(element, style) {
                        element = $(element);
                        style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
                        var value = element.style[style];
                        if (!value && element.currentStyle) value = element.currentStyle[style];

                        if (style == 'opacity') {
                            if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
                                if (value[1]) return parseFloat(value[1]) / 100;
                            return 1.0;
                        }

                        if (value == 'auto') {
                            if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
                                return element['offset' + style.capitalize()] + 'px';
                            return null;
                        }
                        return value;
                    };

                    Element.Methods.setOpacity = function(element, value) {
                        function stripAlpha(filter){
                            return filter.replace(/alpha\([^\)]*\)/gi,'');
                        }
                        element = $(element);
                        var currentStyle = element.currentStyle;
                        if ((currentStyle && !currentStyle.hasLayout) ||
                            (!currentStyle && element.style.zoom == 'normal'))
                            element.style.zoom = 1;

                        var filter = element.getStyle('filter'), style = element.style;
                        if (value == 1 || value === '') {
                            (filter = stripAlpha(filter)) ?
                                style.filter = filter : style.removeAttribute('filter');
                            return element;
                        } else if (value < 0.00001) value = 0;
                        style.filter = stripAlpha(filter) +
                            'alpha(opacity=' + (value * 100) + ')';
                        return element;
                    };

                    Element._attributeTranslations = {
                        read: {
                            names: {
                                'class': 'className',
                                'for':   'htmlFor'
                            },
                            values: {
                                _getAttr: function(element, attribute) {
                                    return element.getAttribute(attribute, 2);
                                },
                                _getAttrNode: function(element, attribute) {
                                    var node = element.getAttributeNode(attribute);
                                    return node ? node.value : "";
                                },
                                _getEv: function(element, attribute) {
                                    attribute = element.getAttribute(attribute);
                                    return attribute ? attribute.toString().slice(23, -2) : null;
                                },
                                _flag: function(element, attribute) {
                                    return $(element).hasAttribute(attribute) ? attribute : null;
                                },
                                style: function(element) {
                                    return element.style.cssText.toLowerCase();
                                },
                                title: function(element) {
                                    return element.title;
                                }
                            }
                        }
                    };

                    Element._attributeTranslations.write = {
                        names: Object.extend({
                            cellpadding: 'cellPadding',
                            cellspacing: 'cellSpacing'
                        }, Element._attributeTranslations.read.names),
                        values: {
                            checked: function(element, value) {
                                element.checked = !!value;
                            },

                            style: function(element, value) {
                                element.style.cssText = value ? value : '';
                            }
                        }
                    };

                    Element._attributeTranslations.has = {};

                    $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
                        'encType maxLength readOnly longDesc').each(function(attr) {
                        Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
                        Element._attributeTranslations.has[attr.toLowerCase()] = attr;
                    });

                    (function(v) {
                        Object.extend(v, {
                            href:        v._getAttr,
                            src:         v._getAttr,
                            type:        v._getAttr,
                            action:      v._getAttrNode,
                            disabled:    v._flag,
                            checked:     v._flag,
                            readonly:    v._flag,
                            multiple:    v._flag,
                            onload:      v._getEv,
                            onunload:    v._getEv,
                            onclick:     v._getEv,
                            ondblclick:  v._getEv,
                            onmousedown: v._getEv,
                            onmouseup:   v._getEv,
                            onmouseover: v._getEv,
                            onmousemove: v._getEv,
                            onmouseout:  v._getEv,
                            onfocus:     v._getEv,
                            onblur:      v._getEv,
                            onkeypress:  v._getEv,
                            onkeydown:   v._getEv,
                            onkeyup:     v._getEv,
                            onsubmit:    v._getEv,
                            onreset:     v._getEv,
                            onselect:    v._getEv,
                            onchange:    v._getEv
                        });
                    })(Element._attributeTranslations.read.values);
                }

                else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
                    Element.Methods.setOpacity = function(element, value) {
                        element = $(element);
                        element.style.opacity = (value == 1) ? 0.999999 :
                            (value === '') ? '' : (value < 0.00001) ? 0 : value;
                        return element;
                    };
                }

                else if (Prototype.Browser.WebKit) {
                    Element.Methods.setOpacity = function(element, value) {
                        element = $(element);
                        element.style.opacity = (value == 1 || value === '') ? '' :
                            (value < 0.00001) ? 0 : value;

                        if (value == 1)
                            if(element.tagName == 'IMG' && element.width) {
                                element.width++; element.width--;
                            } else try {
                            var n = document.createTextNode(' ');
                            element.appendChild(n);
                            element.removeChild(n);
                        } catch (e) { }

                        return element;
                    };

                    // Safari returns margins on body which is incorrect if the child is absolutely
                    // positioned.  For performance reasons, redefine Element#cumulativeOffset for
                    // KHTML/WebKit only.
                    Element.Methods.cumulativeOffset = function(element) {
                        var valueT = 0, valueL = 0;
                        do {
                            valueT += element.offsetTop  || 0;
                            valueL += element.offsetLeft || 0;
                            if (element.offsetParent == document.body)
                                if (Element.getStyle(element, 'position') == 'absolute') break;

                            element = element.offsetParent;
                        } while (element);

                        return Element._returnOffset(valueL, valueT);
                    };
                }

                if (Prototype.Browser.IE || Prototype.Browser.Opera) {
                    // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
                    Element.Methods.update = function(element, content) {
                        element = $(element);

                        if (content && content.toElement) content = content.toElement();
                        if (Object.isElement(content)) return element.update().insert(content);

                        content = Object.toHTML(content);
                        var tagName = element.tagName.toUpperCase();

                        if (tagName in Element._insertionTranslations.tags) {
                            $A(element.childNodes).each(function(node) { element.removeChild(node) });
                            Element._getContentFromAnonymousElement(tagName, content.stripScripts())
                            .each(function(node) { element.appendChild(node) });
                        }
                        else element.innerHTML = content.stripScripts();

                        content.evalScripts.bind(content).defer();
                        return element;
                    };
                }

                if ('outerHTML' in document.createElement('div')) {
                    Element.Methods.replace = function(element, content) {
                        element = $(element);

                        if (content && content.toElement) content = content.toElement();
                        if (Object.isElement(content)) {
                            element.parentNode.replaceChild(content, element);
                            return element;
                        }

                        content = Object.toHTML(content);
                        var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

                        if (Element._insertionTranslations.tags[tagName]) {
                            var nextSibling = element.next();
                            var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
                            parent.removeChild(element);
                            if (nextSibling)
                                fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
                            else
                                fragments.each(function(node) { parent.appendChild(node) });
                        }
                        else element.outerHTML = content.stripScripts();

                        content.evalScripts.bind(content).defer();
                        return element;
                    };
                }

                Element._returnOffset = function(l, t) {
                    var result = [l, t];
                    result.left = l;
                    result.top = t;
                    return result;
                };

                Element._getContentFromAnonymousElement = function(tagName, html) {
                    var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
                    if (t) {
                        div.innerHTML = t[0] + html + t[1];
                        t[2].times(function() { div = div.firstChild });
                    } else div.innerHTML = html;
                    return $A(div.childNodes);
                };

                Element._insertionTranslations = {
                    before: function(element, node) {
                        element.parentNode.insertBefore(node, element);
                    },
                    top: function(element, node) {
                        element.insertBefore(node, element.firstChild);
                    },
                    bottom: function(element, node) {
                        element.appendChild(node);
                    },
                    after: function(element, node) {
                        element.parentNode.insertBefore(node, element.nextSibling);
                    },
                    tags: {
                        TABLE:  ['<table>',                '</table>',                   1],
                        TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
                        TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
                        TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
                        SELECT: ['<select>',               '</select>',                  1]
                    }
                };

                (function() {
                    Object.extend(this.tags, {
                        THEAD: this.tags.TBODY,
                        TFOOT: this.tags.TBODY,
                        TH:    this.tags.TD
                    });
                }).call(Element._insertionTranslations);

                Element.Methods.Simulated = {
                    hasAttribute: function(element, attribute) {
                        attribute = Element._attributeTranslations.has[attribute] || attribute;
                        var node = $(element).getAttributeNode(attribute);
                        return node && node.specified;
                    }
                };

                Element.Methods.ByTag = { };

                Object.extend(Element, Element.Methods);

                if (!Prototype.BrowserFeatures.ElementExtensions &&
                    document.createElement('div').__proto__) {
                    window.HTMLElement = { };
                    window.HTMLElement.prototype = document.createElement('div').__proto__;
                    Prototype.BrowserFeatures.ElementExtensions = true;
                }

                Element.extend = (function() {
                    if (Prototype.BrowserFeatures.SpecificElementExtensions)
                        return Prototype.K;

                    var Methods = { }, ByTag = Element.Methods.ByTag;

                    var extend = Object.extend(function(element) {
                        if (!element || element._extendedByPrototype ||
                            element.nodeType != 1 || element == window) return element;

                        var methods = Object.clone(Methods),
                        tagName = element.tagName, property, value;

                        // extend methods for specific tags
                        if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

                        for (property in methods) {
                            value = methods[property];
                            if (Object.isFunction(value) && !(property in element))
                                element[property] = value.methodize();
                        }

                        element._extendedByPrototype = Prototype.emptyFunction;
                        return element;

                    }, {
                        refresh: function() {
                            // extend methods for all tags (Safari doesn't need this)
                            if (!Prototype.BrowserFeatures.ElementExtensions) {
                                Object.extend(Methods, Element.Methods);
                                Object.extend(Methods, Element.Methods.Simulated);
                            }
                        }
                    });

                    extend.refresh();
                    return extend;
                })();

                Element.hasAttribute = function(element, attribute) {
                    if (element.hasAttribute) return element.hasAttribute(attribute);
                    return Element.Methods.Simulated.hasAttribute(element, attribute);
                };

                Element.addMethods = function(methods) {
                    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

                    if (!methods) {
                        Object.extend(Form, Form.Methods);
                        Object.extend(Form.Element, Form.Element.Methods);
                        Object.extend(Element.Methods.ByTag, {
                            "FORM":     Object.clone(Form.Methods),
                            "INPUT":    Object.clone(Form.Element.Methods),
                            "SELECT":   Object.clone(Form.Element.Methods),
                            "TEXTAREA": Object.clone(Form.Element.Methods)
                        });
                    }

                    if (arguments.length == 2) {
                        var tagName = methods;
                        methods = arguments[1];
                    }

                    if (!tagName) Object.extend(Element.Methods, methods || { });
                    else {
                        if (Object.isArray(tagName)) tagName.each(extend);
                        else extend(tagName);
                    }

                    function extend(tagName) {
                        tagName = tagName.toUpperCase();
                        if (!Element.Methods.ByTag[tagName])
                            Element.Methods.ByTag[tagName] = { };
                        Object.extend(Element.Methods.ByTag[tagName], methods);
                    }

                    function copy(methods, destination, onlyIfAbsent) {
                        onlyIfAbsent = onlyIfAbsent || false;
                        for (var property in methods) {
                            var value = methods[property];
                            if (!Object.isFunction(value)) continue;
                            if (!onlyIfAbsent || !(property in destination))
                                destination[property] = value.methodize();
                        }
                    }

                    function findDOMClass(tagName) {
                        var klass;
                        var trans = {
                            "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
                            "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
                            "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
                            "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
                            "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
                                "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
                                "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
                                "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
                                "FrameSet", "IFRAME": "IFrame"
                        };
                        if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
                        if (window[klass]) return window[klass];
                        klass = 'HTML' + tagName + 'Element';
                        if (window[klass]) return window[klass];
                        klass = 'HTML' + tagName.capitalize() + 'Element';
                        if (window[klass]) return window[klass];

                        window[klass] = { };
                        window[klass].prototype = document.createElement(tagName).__proto__;
                        return window[klass];
                    }

                    if (F.ElementExtensions) {
                        copy(Element.Methods, HTMLElement.prototype);
                        copy(Element.Methods.Simulated, HTMLElement.prototype, true);
                    }

                    if (F.SpecificElementExtensions) {
                        for (var tag in Element.Methods.ByTag) {
                            var klass = findDOMClass(tag);
                            if (Object.isUndefined(klass)) continue;
                            copy(T[tag], klass.prototype);
                        }
                    }

                    Object.extend(Element, Element.Methods);
                    delete Element.ByTag;

                    if (Element.extend.refresh) Element.extend.refresh();
                    Element.cache = { };
                };

                document.viewport = {
                    getDimensions: function() {
                        var dimensions = { };
                        var B = Prototype.Browser;
                        $w('width height').each(function(d) {
                            var D = d.capitalize();
                            dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
                                (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
                        });
                        return dimensions;
                    },

                    getWidth: function() {
                        return this.getDimensions().width;
                    },

                    getHeight: function() {
                        return this.getDimensions().height;
                    },

                    getScrollOffsets: function() {
                        return Element._returnOffset(
                        window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
                        window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
                    }
                };
                /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
                 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
                 * license.  Please see http://www.yui-ext.com/ for more information. */

                var Selector = Class.create({
                    initialize: function(expression) {
                        this.expression = expression.strip();
                        this.compileMatcher();
                    },

                    shouldUseXPath: function() {
                        if (!Prototype.BrowserFeatures.XPath) return false;

                        var e = this.expression;

                        // Safari 3 chokes on :*-of-type and :empty
                        if (Prototype.Browser.WebKit &&
                            (e.include("-of-type") || e.include(":empty")))
                            return false;

                        // XPath can't do namespaced attributes, nor can it read
                        // the "checked" property from DOM nodes
                        if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
                            return false;

                        return true;
                    },

                    compileMatcher: function() {
                        if (this.shouldUseXPath())
                            return this.compileXPathMatcher();

                        var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
                        c = Selector.criteria, le, p, m;

                        if (Selector._cache[e]) {
                            this.matcher = Selector._cache[e];
                            return;
                        }

                        this.matcher = ["this.matcher = function(root) {",
                            "var r = root, h = Selector.handlers, c = false, n;"];

                        while (e && le != e && (/\S/).test(e)) {
                            le = e;
                            for (var i in ps) {
                                p = ps[i];
                                if (m = e.match(p)) {
                                    this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
                                        new Template(c[i]).evaluate(m));
                                    e = e.replace(m[0], '');
                                    break;
                                }
                            }
                        }

                        this.matcher.push("return h.unique(n);\n}");
                        eval(this.matcher.join('\n'));
                        Selector._cache[this.expression] = this.matcher;
                    },

                    compileXPathMatcher: function() {
                        var e = this.expression, ps = Selector.patterns,
                        x = Selector.xpath, le, m;

                        if (Selector._cache[e]) {
                            this.xpath = Selector._cache[e]; return;
                        }

                        this.matcher = ['.//*'];
                        while (e && le != e && (/\S/).test(e)) {
                            le = e;
                            for (var i in ps) {
                                if (m = e.match(ps[i])) {
                                    this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
                                        new Template(x[i]).evaluate(m));
                                    e = e.replace(m[0], '');
                                    break;
                                }
                            }
                        }

                        this.xpath = this.matcher.join('');
                        Selector._cache[this.expression] = this.xpath;
                    },

                    findElements: function(root) {
                        root = root || document;
                        if (this.xpath) return document._getElementsByXPath(this.xpath, root);
                        return this.matcher(root);
                    },

                    match: function(element) {
                        this.tokens = [];

                        var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
                        var le, p, m;

                        while (e && le !== e && (/\S/).test(e)) {
                            le = e;
                            for (var i in ps) {
                                p = ps[i];
                                if (m = e.match(p)) {
                                    // use the Selector.assertions methods unless the selector
                                    // is too complex.
                                    if (as[i]) {
                                        this.tokens.push([i, Object.clone(m)]);
                                        e = e.replace(m[0], '');
                                    } else {
                                        // reluctantly do a document-wide search
                                        // and look for a match in the array
                                        return this.findElements(document).include(element);
                                    }
                                }
                            }
                        }

                        var match = true, name, matches;
                        for (var i = 0, token; token = this.tokens[i]; i++) {
                            name = token[0], matches = token[1];
                            if (!Selector.assertions[name](element, matches)) {
                                match = false; break;
                            }
                        }

                        return match;
                    },

                    toString: function() {
                        return this.expression;
                    },

                    inspect: function() {
                        return "#<Selector:" + this.expression.inspect() + ">";
                    }
                });

                Object.extend(Selector, {
                    _cache: { },

                    xpath: {
                        descendant:   "//*",
                        child:        "/*",
                        adjacent:     "/following-sibling::*[1]",
                        laterSibling: '/following-sibling::*',
                        tagName:      function(m) {
                            if (m[1] == '*') return '';
                            return "[local-name()='" + m[1].toLowerCase() +
                                "' or local-name()='" + m[1].toUpperCase() + "']";
                        },
                        className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
                        id:           "[@id='#{1}']",
                        attrPresence: function(m) {
                            m[1] = m[1].toLowerCase();
                            return new Template("[@#{1}]").evaluate(m);
                        },
                        attr: function(m) {
                            m[1] = m[1].toLowerCase();
                            m[3] = m[5] || m[6];
                            return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
                        },
                        pseudo: function(m) {
                            var h = Selector.xpath.pseudos[m[1]];
                            if (!h) return '';
                            if (Object.isFunction(h)) return h(m);
                            return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
                        },
                        operators: {
                            '=':  "[@#{1}='#{3}']",
                            '!=': "[@#{1}!='#{3}']",
                            '^=': "[starts-with(@#{1}, '#{3}')]",
                            '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
                            '*=': "[contains(@#{1}, '#{3}')]",
                            '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
                            '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
                        },
                        pseudos: {
                            'first-child': '[not(preceding-sibling::*)]',
                            'last-child':  '[not(following-sibling::*)]',
                            'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
                            'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
                            'checked':     "[@checked]",
                            'disabled':    "[@disabled]",
                            'enabled':     "[not(@disabled)]",
                            'not': function(m) {
                                var e = m[6], p = Selector.patterns,
                                x = Selector.xpath, le, v;

                                var exclusion = [];
                                while (e && le != e && (/\S/).test(e)) {
                                    le = e;
                                    for (var i in p) {
                                        if (m = e.match(p[i])) {
                                            v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
                                            exclusion.push("(" + v.substring(1, v.length - 1) + ")");
                                            e = e.replace(m[0], '');
                                            break;
                                        }
                                    }
                                }
                                return "[not(" + exclusion.join(" and ") + ")]";
                            },
                            'nth-child':      function(m) {
                                return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
                            },
                            'nth-last-child': function(m) {
                                return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
                            },
                            'nth-of-type':    function(m) {
                                return Selector.xpath.pseudos.nth("position() ", m);
                            },
                            'nth-last-of-type': function(m) {
                                return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
                            },
                            'first-of-type':  function(m) {
                                m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
                            },
                            'last-of-type':   function(m) {
                                m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
                            },
                            'only-of-type':   function(m) {
                                var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
                            },
                            nth: function(fragment, m) {
                                var mm, formula = m[6], predicate;
                                if (formula == 'even') formula = '2n+0';
                                if (formula == 'odd')  formula = '2n+1';
                                if (mm = formula.match(/^(\d+)$/)) // digit only
                                    return '[' + fragment + "= " + mm[1] + ']';
                                if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
                                    if (mm[1] == "-") mm[1] = -1;
                                    var a = mm[1] ? Number(mm[1]) : 1;
                                    var b = mm[2] ? Number(mm[2]) : 0;
                                    predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
                                        "((#{fragment} - #{b}) div #{a} >= 0)]";
                                    return new Template(predicate).evaluate({
                                        fragment: fragment, a: a, b: b });
                                }
                            }
                        }
                    },

                    criteria: {
                        tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
                        className:    'n = h.className(n, r, "#{1}", c);    c = false;',
                        id:           'n = h.id(n, r, "#{1}", c);           c = false;',
                        attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
                        attr: function(m) {
                            m[3] = (m[5] || m[6]);
                            return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
                        },
                        pseudo: function(m) {
                            if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
                            return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
                        },
                        descendant:   'c = "descendant";',
                        child:        'c = "child";',
                        adjacent:     'c = "adjacent";',
                        laterSibling: 'c = "laterSibling";'
                    },

                    patterns: {
                        // combinators must be listed first
                        // (and descendant needs to be last combinator)
                        laterSibling: /^\s*~\s*/,
                        child:        /^\s*>\s*/,
                        adjacent:     /^\s*\+\s*/,
                        descendant:   /^\s/,

                        // selectors follow
                        tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
                        id:           /^#([\w\-\*]+)(\b|$)/,
                        className:    /^\.([\w\-\*]+)(\b|$)/,
                        pseudo:
                            /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
                        attrPresence: /^\[([\w]+)\]/,
                        attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
                    },

                    // for Selector.match and Element#match
                    assertions: {
                        tagName: function(element, matches) {
                            return matches[1].toUpperCase() == element.tagName.toUpperCase();
                        },

                        className: function(element, matches) {
                            return Element.hasClassName(element, matches[1]);
                        },

                        id: function(element, matches) {
                            return element.id === matches[1];
                        },

                        attrPresence: function(element, matches) {
                            return Element.hasAttribute(element, matches[1]);
                        },

                        attr: function(element, matches) {
                            var nodeValue = Element.readAttribute(element, matches[1]);
                            return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
                        }
                    },

                    handlers: {
                        // UTILITY FUNCTIONS
                        // joins two collections
                        concat: function(a, b) {
                            for (var i = 0, node; node = b[i]; i++)
                                a.push(node);
                            return a;
                        },

                        // marks an array of nodes for counting
                        mark: function(nodes) {
                            var _true = Prototype.emptyFunction;
                            for (var i = 0, node; node = nodes[i]; i++)
                                node._countedByPrototype = _true;
                            return nodes;
                        },

                        unmark: function(nodes) {
                            for (var i = 0, node; node = nodes[i]; i++)
                                node._countedByPrototype = undefined;
                            return nodes;
                        },

                        // mark each child node with its position (for nth calls)
                        // "ofType" flag indicates whether we're indexing for nth-of-type
                        // rather than nth-child
                        index: function(parentNode, reverse, ofType) {
                            parentNode._countedByPrototype = Prototype.emptyFunction;
                            if (reverse) {
                                for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
                                    var node = nodes[i];
                                    if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
                                }
                            } else {
                                for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
                                    if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
                            }
                        },

                        // filters out duplicates and extends all nodes
                        unique: function(nodes) {
                            if (nodes.length == 0) return nodes;
                            var results = [], n;
                            for (var i = 0, l = nodes.length; i < l; i++)
                                if (!(n = nodes[i])._countedByPrototype) {
                                    n._countedByPrototype = Prototype.emptyFunction;
                                    results.push(Element.extend(n));
                                }
                            return Selector.handlers.unmark(results);
                        },

                        // COMBINATOR FUNCTIONS
                        descendant: function(nodes) {
                            var h = Selector.handlers;
                            for (var i = 0, results = [], node; node = nodes[i]; i++)
                                h.concat(results, node.getElementsByTagName('*'));
                            return results;
                        },

                        child: function(nodes) {
                            var h = Selector.handlers;
                            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                                for (var j = 0, child; child = node.childNodes[j]; j++)
                                    if (child.nodeType == 1 && child.tagName != '!') results.push(child);
                            }
                            return results;
                        },

                        adjacent: function(nodes) {
                            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                                var next = this.nextElementSibling(node);
                                if (next) results.push(next);
                            }
                            return results;
                        },

                        laterSibling: function(nodes) {
                            var h = Selector.handlers;
                            for (var i = 0, results = [], node; node = nodes[i]; i++)
                                h.concat(results, Element.nextSiblings(node));
                            return results;
                        },

                        nextElementSibling: function(node) {
                            while (node = node.nextSibling)
                                if (node.nodeType == 1) return node;
                            return null;
                        },

                        previousElementSibling: function(node) {
                            while (node = node.previousSibling)
                                if (node.nodeType == 1) return node;
                            return null;
                        },

                        // TOKEN FUNCTIONS
                        tagName: function(nodes, root, tagName, combinator) {
                            var uTagName = tagName.toUpperCase();
                            var results = [], h = Selector.handlers;
                            if (nodes) {
                                if (combinator) {
                                    // fastlane for ordinary descendant combinators
                                    if (combinator == "descendant") {
                                        for (var i = 0, node; node = nodes[i]; i++)
                                            h.concat(results, node.getElementsByTagName(tagName));
                                        return results;
                                    } else nodes = this[combinator](nodes);
                                    if (tagName == "*") return nodes;
                                }
                                for (var i = 0, node; node = nodes[i]; i++)
                                    if (node.tagName.toUpperCase() === uTagName) results.push(node);
                                return results;
                            } else return root.getElementsByTagName(tagName);
                        },

                        id: function(nodes, root, id, combinator) {
                            var targetNode = $(id), h = Selector.handlers;
                            if (!targetNode) return [];
                            if (!nodes && root == document) return [targetNode];
                            if (nodes) {
                                if (combinator) {
                                    if (combinator == 'child') {
                                        for (var i = 0, node; node = nodes[i]; i++)
                                            if (targetNode.parentNode == node) return [targetNode];
                                    } else if (combinator == 'descendant') {
                                        for (var i = 0, node; node = nodes[i]; i++)
                                            if (Element.descendantOf(targetNode, node)) return [targetNode];
                                    } else if (combinator == 'adjacent') {
                                        for (var i = 0, node; node = nodes[i]; i++)
                                            if (Selector.handlers.previousElementSibling(targetNode) == node)
                                                return [targetNode];
                                    } else nodes = h[combinator](nodes);
                                }
                                for (var i = 0, node; node = nodes[i]; i++)
                                    if (node == targetNode) return [targetNode];
                                return [];
                            }
                            return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
                        },

                        className: function(nodes, root, className, combinator) {
                            if (nodes && combinator) nodes = this[combinator](nodes);
                            return Selector.handlers.byClassName(nodes, root, className);
                        },

                        byClassName: function(nodes, root, className) {
                            if (!nodes) nodes = Selector.handlers.descendant([root]);
                            var needle = ' ' + className + ' ';
                            for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
                                nodeClassName = node.className;
                                if (nodeClassName.length == 0) continue;
                                if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
                                    results.push(node);
                            }
                            return results;
                        },

                        attrPresence: function(nodes, root, attr, combinator) {
                            if (!nodes) nodes = root.getElementsByTagName("*");
                            if (nodes && combinator) nodes = this[combinator](nodes);
                            var results = [];
                            for (var i = 0, node; node = nodes[i]; i++)
                                if (Element.hasAttribute(node, attr)) results.push(node);
                            return results;
                        },

                        attr: function(nodes, root, attr, value, operator, combinator) {
                            if (!nodes) nodes = root.getElementsByTagName("*");
                            if (nodes && combinator) nodes = this[combinator](nodes);
                            var handler = Selector.operators[operator], results = [];
                            for (var i = 0, node; node = nodes[i]; i++) {
                                var nodeValue = Element.readAttribute(node, attr);
                                if (nodeValue === null) continue;
                                if (handler(nodeValue, value)) results.push(node);
                            }
                            return results;
                        },

                        pseudo: function(nodes, name, value, root, combinator) {
                            if (nodes && combinator) nodes = this[combinator](nodes);
                            if (!nodes) nodes = root.getElementsByTagName("*");
                            return Selector.pseudos[name](nodes, value, root);
                        }
                    },

                    pseudos: {
                        'first-child': function(nodes, value, root) {
                            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                                if (Selector.handlers.previousElementSibling(node)) continue;
                                results.push(node);
                            }
                            return results;
                        },
                        'last-child': function(nodes, value, root) {
                            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                                if (Selector.handlers.nextElementSibling(node)) continue;
                                results.push(node);
                            }
                            return results;
                        },
                        'only-child': function(nodes, value, root) {
                            var h = Selector.handlers;
                            for (var i = 0, results = [], node; node = nodes[i]; i++)
                                if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
                                    results.push(node);
                            return results;
                        },
                        'nth-child':        function(nodes, formula, root) {
                            return Selector.pseudos.nth(nodes, formula, root);
                        },
                        'nth-last-child':   function(nodes, formula, root) {
                            return Selector.pseudos.nth(nodes, formula, root, true);
                        },
                        'nth-of-type':      function(nodes, formula, root) {
                            return Selector.pseudos.nth(nodes, formula, root, false, true);
                        },
                        'nth-last-of-type': function(nodes, formula, root) {
                            return Selector.pseudos.nth(nodes, formula, root, true, true);
                        },
                        'first-of-type':    function(nodes, formula, root) {
                            return Selector.pseudos.nth(nodes, "1", root, false, true);
                        },
                        'last-of-type':     function(nodes, formula, root) {
                            return Selector.pseudos.nth(nodes, "1", root, true, true);
                        },
                        'only-of-type':     function(nodes, formula, root) {
                            var p = Selector.pseudos;
                            return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
                        },

                        // handles the an+b logic
                        getIndices: function(a, b, total) {
                            if (a == 0) return b > 0 ? [b] : [];
                            return $R(1, total).inject([], function(memo, i) {
                                if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
                                return memo;
                            });
                        },

                        // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
                        nth: function(nodes, formula, root, reverse, ofType) {
                            if (nodes.length == 0) return [];
                            if (formula == 'even') formula = '2n+0';
                            if (formula == 'odd')  formula = '2n+1';
                            var h = Selector.handlers, results = [], indexed = [], m;
                            h.mark(nodes);
                            for (var i = 0, node; node = nodes[i]; i++) {
                                if (!node.parentNode._countedByPrototype) {
                                    h.index(node.parentNode, reverse, ofType);
                                    indexed.push(node.parentNode);
                                }
                            }
                            if (formula.match(/^\d+$/)) { // just a number
                                formula = Number(formula);
                                for (var i = 0, node; node = nodes[i]; i++)
                                    if (node.nodeIndex == formula) results.push(node);
                            } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
                                if (m[1] == "-") m[1] = -1;
                                var a = m[1] ? Number(m[1]) : 1;
                                var b = m[2] ? Number(m[2]) : 0;
                                var indices = Selector.pseudos.getIndices(a, b, nodes.length);
                                for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
                                    for (var j = 0; j < l; j++)
                                        if (node.nodeIndex == indices[j]) results.push(node);
                                }
                            }
                            h.unmark(nodes);
                            h.unmark(indexed);
                            return results;
                        },

                        'empty': function(nodes, value, root) {
                            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                                // IE treats comments as element nodes
                                if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
                                results.push(node);
                            }
                            return results;
                        },

                        'not': function(nodes, selector, root) {
                            var h = Selector.handlers, selectorType, m;
                            var exclusions = new Selector(selector).findElements(root);
                            h.mark(exclusions);
                            for (var i = 0, results = [], node; node = nodes[i]; i++)
                                if (!node._countedByPrototype) results.push(node);
                            h.unmark(exclusions);
                            return results;
                        },

                        'enabled': function(nodes, value, root) {
                            for (var i = 0, results = [], node; node = nodes[i]; i++)
                                if (!node.disabled) results.push(node);
                            return results;
                        },

                        'disabled': function(nodes, value, root) {
                            for (var i = 0, results = [], node; node = nodes[i]; i++)
                                if (node.disabled) results.push(node);
                            return results;
                        },

                        'checked': function(nodes, value, root) {
                            for (var i = 0, results = [], node; node = nodes[i]; i++)
                                if (node.checked) results.push(node);
                            return results;
                        }
                    },

                    operators: {
                        '=':  function(nv, v) { return nv == v; },
                        '!=': function(nv, v) { return nv != v; },
                        '^=': function(nv, v) { return nv.startsWith(v); },
                        '$=': function(nv, v) { return nv.endsWith(v); },
                        '*=': function(nv, v) { return nv.include(v); },
                        '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
                        '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
                    },

                    split: function(expression) {
                        var expressions = [];
                        expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
                            expressions.push(m[1].strip());
                        });
                        return expressions;
                    },

                    matchElements: function(elements, expression) {
                        var matches = $$(expression), h = Selector.handlers;
                        h.mark(matches);
                        for (var i = 0, results = [], element; element = elements[i]; i++)
                            if (element._countedByPrototype) results.push(element);
                        h.unmark(matches);
                        return results;
                    },

                    findElement: function(elements, expression, index) {
                        if (Object.isNumber(expression)) {
                            index = expression; expression = false;
                        }
                        return Selector.matchElements(elements, expression || '*')[index || 0];
                    },

                    findChildElements: function(element, expressions) {
                        expressions = Selector.split(expressions.join(','));
                        var results = [], h = Selector.handlers;
                        for (var i = 0, l = expressions.length, selector; i < l; i++) {
                            selector = new Selector(expressions[i].strip());
                            h.concat(results, selector.findElements(element));
                        }
                        return (l > 1) ? h.unique(results) : results;
                    }
                });

                if (Prototype.Browser.IE) {
                    Object.extend(Selector.handlers, {
                        // IE returns comment nodes on getElementsByTagName("*").
                        // Filter them out.
                        concat: function(a, b) {
                            for (var i = 0, node; node = b[i]; i++)
                                if (node.tagName !== "!") a.push(node);
                            return a;
                        },

                        // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
                        unmark: function(nodes) {
                            for (var i = 0, node; node = nodes[i]; i++)
                                node.removeAttribute('_countedByPrototype');
                            return nodes;
                        }
                    });
                }

                function $$() {
                    return Selector.findChildElements(document, $A(arguments));
                }
                var Form = {
                    reset: function(form) {
                        $(form).reset();
                        return form;
                    },

                    serializeElements: function(elements, options) {
                        if (typeof options != 'object') options = { hash: !!options };
                        else if (Object.isUndefined(options.hash)) options.hash = true;
                        var key, value, submitted = false, submit = options.submit;

                        var data = elements.inject({ }, function(result, element) {
                            if (!element.disabled && element.name) {
                                key = element.name; value = $(element).getValue();
                                if (value != null && (element.type != 'submit' || (!submitted &&
                                    submit !== false && (!submit || key == submit) && (submitted = true)))) {
                                    if (key in result) {
                                        // a key is already present; construct an array of values
                                        if (!Object.isArray(result[key])) result[key] = [result[key]];
                                        result[key].push(value);
                                    }
                                    else result[key] = value;
                                }
                            }
                            return result;
                        });

                        return options.hash ? data : Object.toQueryString(data);
                    }
                };

                Form.Methods = {
                    serialize: function(form, options) {
                        return Form.serializeElements(Form.getElements(form), options);
                    },

                    getElements: function(form) {
                        return $A($(form).getElementsByTagName('*')).inject([],
                        function(elements, child) {
                            if (Form.Element.Serializers[child.tagName.toLowerCase()])
                                elements.push(Element.extend(child));
                            return elements;
                        }
                    );
                    },

                    getInputs: function(form, typeName, name) {
                        form = $(form);
                        var inputs = form.getElementsByTagName('input');

                        if (!typeName && !name) return $A(inputs).map(Element.extend);

                        for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
                            var input = inputs[i];
                            if ((typeName && input.type != typeName) || (name && input.name != name))
                                continue;
                            matchingInputs.push(Element.extend(input));
                        }

                        return matchingInputs;
                    },

                    disable: function(form) {
                        form = $(form);
                        Form.getElements(form).invoke('disable');
                        return form;
                    },

                    enable: function(form) {
                        form = $(form);
                        Form.getElements(form).invoke('enable');
                        return form;
                    },

                    findFirstElement: function(form) {
                        var elements = $(form).getElements().findAll(function(element) {
                            return 'hidden' != element.type && !element.disabled;
                        });
                        var firstByIndex = elements.findAll(function(element) {
                            return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
                        }).sortBy(function(element) { return element.tabIndex }).first();

                        return firstByIndex ? firstByIndex : elements.find(function(element) {
                            return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
                        });
                    },

                    focusFirstElement: function(form) {
                        form = $(form);
                        form.findFirstElement().activate();
                        return form;
                    },

                    request: function(form, options) {
                        form = $(form), options = Object.clone(options || { });

                        var params = options.parameters, action = form.readAttribute('action') || '';
                        if (action.blank()) action = window.location.href;
                        options.parameters = form.serialize(true);

                        if (params) {
                            if (Object.isString(params)) params = params.toQueryParams();
                            Object.extend(options.parameters, params);
                        }

                        if (form.hasAttribute('method') && !options.method)
                            options.method = form.method;

                        return new Ajax.Request(action, options);
                    }
                };

                /*--------------------------------------------------------------------------*/

                Form.Element = {
                    focus: function(element) {
                        $(element).focus();
                        return element;
                    },

                    select: function(element) {
                        $(element).select();
                        return element;
                    }
                };

                Form.Element.Methods = {
                    serialize: function(element) {
                        element = $(element);
                        if (!element.disabled && element.name) {
                            var value = element.getValue();
                            if (value != undefined) {
                                var pair = { };
                                pair[element.name] = value;
                                return Object.toQueryString(pair);
                            }
                        }
                        return '';
                    },

                    getValue: function(element) {
                        element = $(element);
                        var method = element.tagName.toLowerCase();
                        return Form.Element.Serializers[method](element);
                    },

                    setValue: function(element, value) {
                        element = $(element);
                        var method = element.tagName.toLowerCase();
                        Form.Element.Serializers[method](element, value);
                        return element;
                    },

                    clear: function(element) {
                        $(element).value = '';
                        return element;
                    },

                    present: function(element) {
                        return $(element).value != '';
                    },

                    activate: function(element) {
                        element = $(element);
                        try {
                            element.focus();
                            if (element.select && (element.tagName.toLowerCase() != 'input' ||
                                !['button', 'reset', 'submit'].include(element.type)))
                                element.select();
                        } catch (e) { }
                        return element;
                    },

                    disable: function(element) {
                        element = $(element);
                        element.blur();
                        element.disabled = true;
                        return element;
                    },

                    enable: function(element) {
                        element = $(element);
                        element.disabled = false;
                        return element;
                    }
                };

                /*--------------------------------------------------------------------------*/

                var Field = Form.Element;
                var $F = Form.Element.Methods.getValue;

                /*--------------------------------------------------------------------------*/

                Form.Element.Serializers = {
                    input: function(element, value) {
                        switch (element.type.toLowerCase()) {
                            case 'checkbox':
                            case 'radio':
                                return Form.Element.Serializers.inputSelector(element, value);
                            default:
                                return Form.Element.Serializers.textarea(element, value);
                        }
                    },

                    inputSelector: function(element, value) {
                        if (Object.isUndefined(value)) return element.checked ? element.value : null;
                        else element.checked = !!value;
                    },

                    textarea: function(element, value) {
                        if (Object.isUndefined(value)) return element.value;
                        else element.value = value;
                    },

                    select: function(element, index) {
                        if (Object.isUndefined(index))
                            return this[element.type == 'select-one' ?
                                    'selectOne' : 'selectMany'](element);
                        else {
                            var opt, value, single = !Object.isArray(index);
                            for (var i = 0, length = element.length; i < length; i++) {
                                opt = element.options[i];
                                value = this.optionValue(opt);
                                if (single) {
                                    if (value == index) {
                                        opt.selected = true;
                                        return;
                                    }
                                }
                                else opt.selected = index.include(value);
                            }
                        }
                    },

                    selectOne: function(element) {
                        var index = element.selectedIndex;
                        return index >= 0 ? this.optionValue(element.options[index]) : null;
                    },

                    selectMany: function(element) {
                        var values, length = element.length;
                        if (!length) return null;

                        for (var i = 0, values = []; i < length; i++) {
                            var opt = element.options[i];
                            if (opt.selected) values.push(this.optionValue(opt));
                        }
                        return values;
                    },

                    optionValue: function(opt) {
                        // extend element because hasAttribute may not be native
                        return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
                    }
                };

                /*--------------------------------------------------------------------------*/

                Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
                    initialize: function($super, element, frequency, callback) {
                        $super(callback, frequency);
                        this.element   = $(element);
                        this.lastValue = this.getValue();
                    },

                    execute: function() {
                        var value = this.getValue();
                        if (Object.isString(this.lastValue) && Object.isString(value) ?
                            this.lastValue != value : String(this.lastValue) != String(value)) {
                            this.callback(this.element, value);
                            this.lastValue = value;
                        }
                    }
                });

                Form.Element.Observer = Class.create(Abstract.TimedObserver, {
                    getValue: function() {
                        return Form.Element.getValue(this.element);
                    }
                });

                Form.Observer = Class.create(Abstract.TimedObserver, {
                    getValue: function() {
                        return Form.serialize(this.element);
                    }
                });

                /*--------------------------------------------------------------------------*/

                Abstract.EventObserver = Class.create({
                    initialize: function(element, callback) {
                        this.element  = $(element);
                        this.callback = callback;

                        this.lastValue = this.getValue();
                        if (this.element.tagName.toLowerCase() == 'form')
                            this.registerFormCallbacks();
                        else
                            this.registerCallback(this.element);
                    },

                    onElementEvent: function() {
                        var value = this.getValue();
                        if (this.lastValue != value) {
                            this.callback(this.element, value);
                            this.lastValue = value;
                        }
                    },

                    registerFormCallbacks: function() {
                        Form.getElements(this.element).each(this.registerCallback, this);
                    },

                    registerCallback: function(element) {
                        if (element.type) {
                            switch (element.type.toLowerCase()) {
                                case 'checkbox':
                                case 'radio':
                                    Event.observe(element, 'click', this.onElementEvent.bind(this));
                                    break;
                                default:
                                    Event.observe(element, 'change', this.onElementEvent.bind(this));
                                    break;
                            }
                        }
                    }
                });

                Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
                    getValue: function() {
                        return Form.Element.getValue(this.element);
                    }
                });

                Form.EventObserver = Class.create(Abstract.EventObserver, {
                    getValue: function() {
                        return Form.serialize(this.element);
                    }
                });
                if (!window.Event) var Event = { };

                Object.extend(Event, {
                    KEY_BACKSPACE: 8,
                    KEY_TAB:       9,
                    KEY_RETURN:   13,
                    KEY_ESC:      27,
                    KEY_LEFT:     37,
                    KEY_UP:       38,
                    KEY_RIGHT:    39,
                    KEY_DOWN:     40,
                    KEY_DELETE:   46,
                    KEY_HOME:     36,
                    KEY_END:      35,
                    KEY_PAGEUP:   33,
                    KEY_PAGEDOWN: 34,
                    KEY_INSERT:   45,

                    cache: { },

                    relatedTarget: function(event) {
                        var element;
                        switch(event.type) {
                            case 'mouseover': element = event.fromElement; break;
                            case 'mouseout':  element = event.toElement;   break;
                            default: return null;
                        }
                        return Element.extend(element);
                    }
                });

                Event.Methods = (function() {
                    var isButton;

                    if (Prototype.Browser.IE) {
                        var buttonMap = { 0: 1, 1: 4, 2: 2 };
                        isButton = function(event, code) {
                            return event.button == buttonMap[code];
                        };

                    } else if (Prototype.Browser.WebKit) {
                        isButton = function(event, code) {
                            switch (code) {
                                case 0: return event.which == 1 && !event.metaKey;
                                case 1: return event.which == 1 && event.metaKey;
                                default: return false;
                            }
                        };

                    } else {
                        isButton = function(event, code) {
                            return event.which ? (event.which === code + 1) : (event.button === code);
                        };
                    }

                    return {
                        isLeftClick:   function(event) { return isButton(event, 0) },
                        isMiddleClick: function(event) { return isButton(event, 1) },
                        isRightClick:  function(event) { return isButton(event, 2) },

                        element: function(event) {
                            var node = Event.extend(event).target;
                            return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
                        },

                        findElement: function(event, expression) {
                            var element = Event.element(event);
                            if (!expression) return element;
                            var elements = [element].concat(element.ancestors());
                            return Selector.findElement(elements, expression, 0);
                        },

                        pointer: function(event) {
                            return {
                                x: event.pageX || (event.clientX +
                                    (document.documentElement.scrollLeft || document.body.scrollLeft)),
                                y: event.pageY || (event.clientY +
                                    (document.documentElement.scrollTop || document.body.scrollTop))
                            };
                        },

                        pointerX: function(event) { return Event.pointer(event).x },
                        pointerY: function(event) { return Event.pointer(event).y },

                        stop: function(event) {
                            Event.extend(event);
                            event.preventDefault();
                            event.stopPropagation();
                            event.stopped = true;
                        }
                    };
                })();

                Event.extend = (function() {
                    var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
                        m[name] = Event.Methods[name].methodize();
                        return m;
                    });

                    if (Prototype.Browser.IE) {
                        Object.extend(methods, {
                            stopPropagation: function() { this.cancelBubble = true },
                            preventDefault:  function() { this.returnValue = false },
                            inspect: function() { return "[object Event]" }
                        });

                        return function(event) {
                            if (!event) return false;
                            if (event._extendedByPrototype) return event;

                            event._extendedByPrototype = Prototype.emptyFunction;
                            var pointer = Event.pointer(event);
                            Object.extend(event, {
                                target: event.srcElement,
                                relatedTarget: Event.relatedTarget(event),
                                pageX:  pointer.x,
                                pageY:  pointer.y
                            });
                            return Object.extend(event, methods);
                        };

                    } else {
                        Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
                        Object.extend(Event.prototype, methods);
                        return Prototype.K;
                    }
                })();

                Object.extend(Event, (function() {
                    var cache = Event.cache;

                    function getEventID(element) {
                        if (element._prototypeEventID) return element._prototypeEventID[0];
                        arguments.callee.id = arguments.callee.id || 1;
                        return element._prototypeEventID = [++arguments.callee.id];
                    }

                    function getDOMEventName(eventName) {
                        if (eventName && eventName.include(':')) return "dataavailable";
                        return eventName;
                    }

                    function getCacheForID(id) {
                        return cache[id] = cache[id] || { };
                    }

                    function getWrappersForEventName(id, eventName) {
                        var c = getCacheForID(id);
                        return c[eventName] = c[eventName] || [];
                    }

                    function createWrapper(element, eventName, handler) {
                        var id = getEventID(element);
                        var c = getWrappersForEventName(id, eventName);
                        if (c.pluck("handler").include(handler)) return false;

                        var wrapper = function(event) {
                            if (!Event || !Event.extend ||
                                (event.eventName && event.eventName != eventName))
                                return false;

                            Event.extend(event);
                            handler.call(element, event);
                        };

                        wrapper.handler = handler;
                        c.push(wrapper);
                        return wrapper;
                    }

                    function findWrapper(id, eventName, handler) {
                        var c = getWrappersForEventName(id, eventName);
                        return c.find(function(wrapper) { return wrapper.handler == handler });
                    }

                    function destroyWrapper(id, eventName, handler) {
                        var c = getCacheForID(id);
                        if (!c[eventName]) return false;
                        c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
                    }

                    function destroyCache() {
                        for (var id in cache)
                            for (var eventName in cache[id])
                                cache[id][eventName] = null;
                    }

                    if (window.attachEvent) {
                        window.attachEvent("onunload", destroyCache);
                    }

                    return {
                        observe: function(element, eventName, handler) {
                            element = $(element);
                            var name = getDOMEventName(eventName);

                            var wrapper = createWrapper(element, eventName, handler);
                            if (!wrapper) return element;

                            if (element.addEventListener) {
                                element.addEventListener(name, wrapper, false);
                            } else {
                                element.attachEvent("on" + name, wrapper);
                            }

                            return element;
                        },

                        stopObserving: function(element, eventName, handler) {
                            element = $(element);
                            var id = getEventID(element), name = getDOMEventName(eventName);

                            if (!handler && eventName) {
                                getWrappersForEventName(id, eventName).each(function(wrapper) {
                                    element.stopObserving(eventName, wrapper.handler);
                                });
                                return element;

                            } else if (!eventName) {
                                Object.keys(getCacheForID(id)).each(function(eventName) {
                                    element.stopObserving(eventName);
                                });
                                return element;
                            }

                            var wrapper = findWrapper(id, eventName, handler);
                            if (!wrapper) return element;

                            if (element.removeEventListener) {
                                element.removeEventListener(name, wrapper, false);
                            } else {
                                element.detachEvent("on" + name, wrapper);
                            }

                            destroyWrapper(id, eventName, handler);

                            return element;
                        },

                        fire: function(element, eventName, memo) {
                            element = $(element);
                            if (element == document && document.createEvent && !element.dispatchEvent)
                                element = document.documentElement;

                            var event;
                            if (document.createEvent) {
                                event = document.createEvent("HTMLEvents");
                                event.initEvent("dataavailable", true, true);
                            } else {
                                event = document.createEventObject();
                                event.eventType = "ondataavailable";
                            }

                            event.eventName = eventName;
                            event.memo = memo || { };

                            if (document.createEvent) {
                                element.dispatchEvent(event);
                            } else {
                                element.fireEvent(event.eventType, event);
                            }

                            return Event.extend(event);
                        }
                    };
                })());

                Object.extend(Event, Event.Methods);

                Element.addMethods({
                    fire:          Event.fire,
                    observe:       Event.observe,
                    stopObserving: Event.stopObserving
                });

                Object.extend(document, {
                    fire:          Element.Methods.fire.methodize(),
                    observe:       Element.Methods.observe.methodize(),
                    stopObserving: Element.Methods.stopObserving.methodize(),
                    loaded:        false
                });

                (function() {
                    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards and John Resig. */

                    var timer;

                    function fireContentLoadedEvent() {
                        if (document.loaded) return;
                        if (timer) window.clearInterval(timer);
                        document.fire("dom:loaded");
                        document.loaded = true;
                    }

                    if (document.addEventListener) {
                        if (Prototype.Browser.WebKit) {
                            timer = window.setInterval(function() {
                                if (/loaded|complete/.test(document.readyState))
                                    fireContentLoadedEvent();
                            }, 0);

                            Event.observe(window, "load", fireContentLoadedEvent);

                        } else {
                            document.addEventListener("DOMContentLoaded",
                            fireContentLoadedEvent, false);
                        }

                    } else {
                        document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
                        $("__onDOMContentLoaded").onreadystatechange = function() {
                            if (this.readyState == "complete") {
                                this.onreadystatechange = null;
                                fireContentLoadedEvent();
                            }
                        };
                    }
                })();
                /*------------------------------- DEPRECATED -------------------------------*/

                Hash.toQueryString = Object.toQueryString;

                var Toggle = { display: Element.toggle };

                Element.Methods.childOf = Element.Methods.descendantOf;

                var Insertion = {
                    Before: function(element, content) {
                        return Element.insert(element, {before:content});
                    },

                    Top: function(element, content) {
                        return Element.insert(element, {top:content});
                    },

                    Bottom: function(element, content) {
                        return Element.insert(element, {bottom:content});
                    },

                    After: function(element, content) {
                        return Element.insert(element, {after:content});
                    }
                };

                var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

                // This should be moved to script.aculo.us; notice the deprecated methods
                // further below, that map to the newer Element methods.
                var Position = {
                    // set to true if needed, warning: firefox performance problems
                    // NOT neeeded for page scrolling, only if draggable contained in
                    // scrollable elements
                    includeScrollOffsets: false,

                    // must be called before calling withinIncludingScrolloffset, every time the
                    // page is scrolled
                    prepare: function() {
                        this.deltaX =  window.pageXOffset
                            || document.documentElement.scrollLeft
                            || document.body.scrollLeft
                            || 0;
                        this.deltaY =  window.pageYOffset
                            || document.documentElement.scrollTop
                            || document.body.scrollTop
                            || 0;
                    },

                    // caches x/y coordinate pair to use with overlap
                    within: function(element, x, y) {
                        if (this.includeScrollOffsets)
                            return this.withinIncludingScrolloffsets(element, x, y);
                        this.xcomp = x;
                        this.ycomp = y;
                        this.offset = Element.cumulativeOffset(element);

                        return (y >= this.offset[1] &&
                            y <  this.offset[1] + element.offsetHeight &&
                            x >= this.offset[0] &&
                            x <  this.offset[0] + element.offsetWidth);
                    },

                    withinIncludingScrolloffsets: function(element, x, y) {
                        var offsetcache = Element.cumulativeScrollOffset(element);

                        this.xcomp = x + offsetcache[0] - this.deltaX;
                        this.ycomp = y + offsetcache[1] - this.deltaY;
                        this.offset = Element.cumulativeOffset(element);

                        return (this.ycomp >= this.offset[1] &&
                            this.ycomp <  this.offset[1] + element.offsetHeight &&
                            this.xcomp >= this.offset[0] &&
                            this.xcomp <  this.offset[0] + element.offsetWidth);
                    },

                    // within must be called directly before
                    overlap: function(mode, element) {
                        if (!mode) return 0;
                        if (mode == 'vertical')
                            return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
                            element.offsetHeight;
                        if (mode == 'horizontal')
                            return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
                            element.offsetWidth;
                    },

                    // Deprecation layer -- use newer Element methods now (1.5.2).

                    cumulativeOffset: Element.Methods.cumulativeOffset,

                    positionedOffset: Element.Methods.positionedOffset,

                    absolutize: function(element) {
                        Position.prepare();
                        return Element.absolutize(element);
                    },

                    relativize: function(element) {
                        Position.prepare();
                        return Element.relativize(element);
                    },

                    realOffset: Element.Methods.cumulativeScrollOffset,

                    offsetParent: Element.Methods.getOffsetParent,

                    page: Element.Methods.viewportOffset,

                    clone: function(source, target, options) {
                        options = options || { };
                        return Element.clonePosition(target, source, options);
                    }
                };

                /*--------------------------------------------------------------------------*/

                if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
                    function iter(name) {
                        return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
                    }

                    instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
                        function(element, className) {
                        className = className.toString().strip();
                        var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
                        return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
                    } : function(element, className) {
                        className = className.toString().strip();
                        var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
                        if (!classNames && !className) return elements;

                        var nodes = $(element).getElementsByTagName('*');
                        className = ' ' + className + ' ';

                        for (var i = 0, child, cn; child = nodes[i]; i++) {
                            if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
                                (classNames && classNames.all(function(name) {
                                return !name.toString().blank() && cn.include(' ' + name + ' ');
                            }))))
                        elements.push(Element.extend(child));
                    }
                    return elements;
                };

                return function(className, parentElement) {
                    return $(parentElement || document.body).getElementsByClassName(className);
                };
            }(Element.Methods);

            /*--------------------------------------------------------------------------*/

            Element.ClassNames = Class.create();
            Element.ClassNames.prototype = {
                initialize: function(element) {
                    this.element = $(element);
                },

                _each: function(iterator) {
                    this.element.className.split(/\s+/).select(function(name) {
                        return name.length > 0;
                    })._each(iterator);
                },

                set: function(className) {
                    this.element.className = className;
                },

                add: function(classNameToAdd) {
                    if (this.include(classNameToAdd)) return;
                    this.set($A(this).concat(classNameToAdd).join(' '));
                },

                remove: function(classNameToRemove) {
                    if (!this.include(classNameToRemove)) return;
                    this.set($A(this).without(classNameToRemove).join(' '));
                },

                toString: function() {
                    return $A(this).join(' ');
                }
            };

            Object.extend(Element.ClassNames.prototype, Enumerable);

            /*--------------------------------------------------------------------------*/

            Element.addMethods();