/*  Prototype JavaScript framework, version 1.5.0
 *  (c) 2005-2007 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://prototype.conio.net/
 *
*/
var Prototype = {
    Version: '1.5.0',
    BrowserFeatures: {
        XPath: !!document.evaluate
    },
    ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
    emptyFunction: function() {},
    K: function(x) {
        return x
    }
}
var Class = {
    create: function() {
        return function() {
            this.initialize.apply(this, arguments);
        }
    }
}
var Abstract = new Object();
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 === undefined) return 'undefined';
            if (object === null) return 'null';
            return object.inspect ? object.inspect() : object.toString();
        } catch (e) {
            if (e instanceof RangeError) return '...';
            throw e;
        }
    },
    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);
    }
});
Function.prototype.bind = function() {
    var __method = this, args = $A(arguments), object = args.shift();
    return function() {
        return __method.apply(object, args.concat($A(arguments)));
    }
}
Function.prototype.bindAsEventListener = function(object) {
    var __method = this, args = $A(arguments), object = args.shift();
    return function(event) {
        return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));
    }
}
Object.extend(Number.prototype, {
    toColorPart: function() {
        var digits = this.toString(16);
        if (this < 16) return '0' + digits;
        return digits;
    },
    succ: function() {
        return this + 1;
    },
    times: function(iterator) {
        $R(0, this, true).each(iterator);
        return this;
    }
});
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;
    }
}
var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
    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);
    },
    stop: function() {
        if (!this.timer) return;
        clearInterval(this.timer);
        this.timer = null;
    },
    onTimerEvent: function() {
        if (!this.currentlyExecuting) {
            try {
                this.currentlyExecuting = true;
                this.callback(this);
            } finally {
                this.currentlyExecuting = false;
            }
        }
    }
}
String.interpret = function(value){
    return value == null ? '' : String(value);
}
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 = count === undefined ? 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 this;
    },
    truncate: function(length, truncation) {
        length = length || 30;
        truncation = truncation === undefined ? '...' : truncation;
        return this.length > length ?
        this.slice(0, length - truncation.length) + truncation : 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 div = document.createElement('div');
        var text = document.createTextNode(this);
        div.appendChild(text);
        return div.innerHTML;
    },
    unescapeHTML: function() {
        var div = document.createElement('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 name = decodeURIComponent(pair[0]);
                var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;
                if (hash[name] !== undefined) {
                    if (hash[name].constructor != Array)
                        hash[name] = [hash[name]];
                    if (value) hash[name].push(value);
                }
                else hash[name] = 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);
    },
    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.replace(/\\/g, '\\\\');
        if (useDoubleQuotes)
            return '"' + escapedString.replace(/"/g, '\\"') + '"';
        else
            return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    }
});
String.prototype.gsub.prepareReplacement = function(replacement) {
    if (typeof replacement == 'function') return replacement;
    var template = new Template(replacement);
    return function(match) {
        return template.evaluate(match)
    };
}
String.prototype.parseQuery = String.prototype.toQueryParams;
var Template = Class.create();
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
Template.prototype = {
    initialize: function(template, pattern) {
        this.template = template.toString();
        this.pattern  = pattern || Template.Pattern;
    },
    evaluate: function(object) {
        return this.template.gsub(this.pattern, function(match) {
            var before = match[1];
            if (before == '\\') return match[2];
            return before + String.interpret(object[match[3]]);
        });
    }
}
var $break    = new Object();
var $continue = new Object();
var Enumerable = {
    each: function(iterator) {
        var index = 0;
        try {
            this._each(function(value) {
                try {
                    iterator(value, index++);
                } catch (e) {
                    if (e != $continue) throw e;
                }
            });
        } catch (e) {
            if (e != $break) throw e;
        }
        return this;
    },
    eachSlice: function(number, iterator) {
        var index = -number, slices = [], array = this.toArray();
        while ((index += number) < array.length)
            slices.push(array.slice(index, index+number));
        return slices.map(iterator);
    },
    all: function(iterator) {
        var result = true;
        this.each(function(value, index) {
            result = result && !!(iterator || Prototype.K)(value, index);
            if (!result) throw $break;
        });
        return result;
    },
    any: function(iterator) {
        var result = false;
        this.each(function(value, index) {
            if (result = !!(iterator || Prototype.K)(value, index))
                throw $break;
        });
        return result;
    },
    collect: function(iterator) {
        var results = [];
        this.each(function(value, index) {
            results.push((iterator || Prototype.K)(value, index));
        });
        return results;
    },
    detect: function(iterator) {
        var result;
        this.each(function(value, index) {
            if (iterator(value, index)) {
                result = value;
                throw $break;
            }
        });
        return result;
    },
    findAll: function(iterator) {
        var results = [];
        this.each(function(value, index) {
            if (iterator(value, index))
                results.push(value);
        });
        return results;
    },
    grep: function(pattern, iterator) {
        var results = [];
        this.each(function(value, index) {
            var stringValue = value.toString();
            if (stringValue.match(pattern))
                results.push((iterator || Prototype.K)(value, index));
        })
        return results;
    },
    include: function(object) {
        var found = false;
        this.each(function(value) {
            if (value == object) {
                found = true;
                throw $break;
            }
        });
        return found;
    },
    inGroupsOf: function(number, fillWith) {
        fillWith = fillWith === undefined ? null : fillWith;
        return this.eachSlice(number, function(slice) {
            while(slice.length < number) slice.push(fillWith);
            return slice;
        });
    },
    inject: function(memo, iterator) {
        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) {
        var result;
        this.each(function(value, index) {
            value = (iterator || Prototype.K)(value, index);
            if (result == undefined || value >= result)
                result = value;
        });
        return result;
    },
    min: function(iterator) {
        var result;
        this.each(function(value, index) {
            value = (iterator || Prototype.K)(value, index);
            if (result == undefined || value < result)
                result = value;
        });
        return result;
    },
    partition: function(iterator) {
        var trues = [], falses = [];
        this.each(function(value, index) {
            ((iterator || Prototype.K)(value, index) ?
                trues : falses).push(value);
        });
        return [trues, falses];
    },
    pluck: function(property) {
        var results = [];
        this.each(function(value, index) {
            results.push(value[property]);
        });
        return results;
    },
    reject: function(iterator) {
        var results = [];
        this.each(function(value, index) {
            if (!iterator(value, index))
                results.push(value);
        });
        return results;
    },
    sortBy: function(iterator) {
        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 = $A(arguments);
        if (typeof args.last() == 'function')
            iterator = args.pop();
        var collections = [this].concat(args).map($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,
    member:  Enumerable.include,
    entries: Enumerable.toArray
});
var $A = Array.from = function(iterable) {
    if (!iterable) return [];
    if (iterable.toArray) {
        return iterable.toArray();
    } else {
        var results = [];
        for (var i = 0, length = iterable.length; i < length; i++)
            results.push(iterable[i]);
        return results;
    }
}
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(value && value.constructor == Array ?
                value.flatten() : [value]);
        });
    },
    without: function() {
        var values = $A(arguments);
        return this.select(function(value) {
            return !values.include(value);
        });
    },
    indexOf: function(object) {
        for (var i = 0, length = this.length; i < length; i++)
            if (this[i] == object) return i;
        return -1;
    },
    reverse: function(inline) {
        return (inline !== false ? this : this.toArray())._reverse();
    },
    reduce: function() {
        return this.length > 1 ? this : this[0];
    },
    uniq: function() {
        return this.inject([], function(array, value) {
            return array.include(value) ? array : array.concat([value]);
        });
    },
    clone: function() {
        return [].concat(this);
    },
    size: function() {
        return this.length;
    },
    inspect: function() {
        return '[' + this.map(Object.inspect).join(', ') + ']';
    }
});
Array.prototype.toArray = Array.prototype.clone;
function $w(string){
    string = string.strip();
    return string ? string.split(/\s+/) : [];
}
if(window.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(arguments[i].constructor == Array) {
                for(var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
                    array.push(arguments[i][j]);
            } else {
                array.push(arguments[i]);
            }
        }
        return array;
    }
}
var Hash = function(obj) {
    Object.extend(this, obj || {});
};
Object.extend(Hash, {
    toQueryString: function(obj) {
        var parts = [];
        this.prototype._each.call(obj, function(pair) {
            if (!pair.key) return;
            if (pair.value && pair.value.constructor == Array) {
                var values = pair.value.compact();
                if (values.length < 2) pair.value = values.reduce();
                else {
                    key = encodeURIComponent(pair.key);
                    values.each(function(value) {
                        value = value != undefined ? encodeURIComponent(value) : '';
                        parts.push(key + '=' + encodeURIComponent(value));
                    });
                    return;
                }
            }
            if (pair.value == undefined) pair[1] = '';
            parts.push(pair.map(encodeURIComponent).join('='));
        });
        return parts.join('&');
    }
});
Object.extend(Hash.prototype, Enumerable);
Object.extend(Hash.prototype, {
    _each: function(iterator) {
        for (var key in this) {
            var value = this[key];
            if (value && value == Hash.prototype[key]) continue;
            var pair = [key, value];
            pair.key = key;
            pair.value = value;
            iterator(pair);
        }
    },
    keys: function() {
        return this.pluck('key');
    },
    values: function() {
        return this.pluck('value');
    },
    merge: function(hash) {
        return $H(hash).inject(this, function(mergedHash, pair) {
            mergedHash[pair.key] = pair.value;
            return mergedHash;
        });
    },
    remove: function() {
        var result;
        for(var i = 0, length = arguments.length; i < length; i++) {
            var value = this[arguments[i]];
            if (value !== undefined){
                if (result === undefined) result = value;
                else {
                    if (result.constructor != Array) result = [result];
                    result.push(value)
                }
            }
            delete this[arguments[i]];
        }
        return result;
    },
    toQueryString: function() {
        return Hash.toQueryString(this);
    },
    inspect: function() {
        return '#<Hash:{' + this.map(function(pair) {
            return pair.map(Object.inspect).join(': ');
        }).join(', ') + '}>';
    }
});
function $H(object) {
    if (object && object.constructor == Hash) return object;
    return new Hash(object);
};
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
    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 (typeof responder[callback] == 'function') {
                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 = function() {};
Ajax.Base.prototype = {
    setOptions: function(options) {
        this.options = {
            method:       'post',
            asynchronous: true,
            contentType:  'application/x-www-form-urlencoded',
            encoding:     'UTF-8',
            parameters:   ''
        }
        Object.extend(this.options, options || {});
        this.options.method = this.options.method.toLowerCase();
        if (typeof this.options.parameters == 'string')
            this.options.parameters = this.options.parameters.toQueryParams();
    }
}
Ajax.Request = Class.create();
Ajax.Request.Events =
    ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
    _complete: false,
    initialize: function(url, options) {
        this.transport = Ajax.getTransport();
        this.setOptions(options);
        this.request(url);
    },
    request: function(url) {
        this.url = url;
        this.method = this.options.method;
        var params = this.options.parameters;
        if (!['get', 'post'].include(this.method)) {
            params['_method'] = this.method;
            this.method = 'post';
        }
        params = Hash.toQueryString(params);
        if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='
        if (this.method == 'get' && params)
            this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;
        try {
            Ajax.Responders.dispatch('onCreate', this, this.transport);
            this.transport.open(this.method.toUpperCase(), this.url,
                this.options.asynchronous);
            if (this.options.asynchronous)
                setTimeout(function() {
                    this.respondToReadyState(1)
                }.bind(this), 10);
            this.transport.onreadystatechange = this.onStateChange.bind(this);
            this.setRequestHeaders();
            var body = this.method == 'post' ? (this.options.postBody || params) : null;
            this.transport.send(body);
            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 : '');
            if (this.transport.overrideMimeType &&
                (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
                headers['Connection'] = 'close';
        }
        if (typeof this.options.requestHeaders == 'object') {
            var extras = this.options.requestHeaders;
            if (typeof extras.push == 'function')
                for (var i = 0, length = extras.length; i < length; i += 2)
                    headers[extras[i]] = extras[i+1];
            else
                $H(extras).each(function(pair) {
                    headers[pair.key] = pair.value
                });
        }
        for (var name in headers)
            this.transport.setRequestHeader(name, headers[name]);
    },
    success: function() {
        return !this.transport.status
        || (this.transport.status >= 200 && this.transport.status < 300);
    },
    respondToReadyState: function(readyState) {
        var state = Ajax.Request.Events[readyState];
        var transport = this.transport, json = this.evalJSON();
        if (state == 'Complete') {
            try {
                this._complete = true;
                (this.options['on' + this.transport.status]
                    || this.options['on' + (this.success() ? 'Success' : 'Failure')]
                    || Prototype.emptyFunction)(transport, json);
            } catch (e) {
                this.dispatchException(e);
            }
            if ((this.getHeader('Content-type') || 'text/javascript').strip().
                match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
                this.evalResponse();
        }
        try {
            (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
            Ajax.Responders.dispatch('on' + state, this, transport, json);
        } catch (e) {
            this.dispatchException(e);
        }
        if (state == 'Complete') {
            this.transport.onreadystatechange = Prototype.emptyFunction;
        }
    },
    getHeader: function(name) {
        try {
            return this.transport.getResponseHeader(name);
        } catch (e) {
            return null
        }
    },
    evalJSON: function() {
        try {
            var json = this.getHeader('X-JSON');
            return json ? eval('(' + json + ')') : null;
        } catch (e) {
            return null
        }
    },
    evalResponse: function() {
        try {
            return eval(this.transport.responseText);
        } catch (e) {
            this.dispatchException(e);
        }
    },
    dispatchException: function(exception) {
        (this.options.onException || Prototype.emptyFunction)(this, exception);
        Ajax.Responders.dispatch('onException', this, exception);
    }
});
Ajax.Updater = Class.create();
Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
    initialize: function(container, url, options) {
        this.container = {
            success: (container.success || container),
            failure: (container.failure || (container.success ? null : container))
        }
        this.transport = Ajax.getTransport();
        this.setOptions(options);
        var onComplete = this.options.onComplete || Prototype.emptyFunction;
        this.options.onComplete = (function(transport, param) {
            this.updateContent();
            onComplete(transport, param);
        }).bind(this);
        this.request(url);
    },
    updateContent: function() {
        var receiver = this.container[this.success() ? 'success' : 'failure'];
        var response = this.transport.responseText;
        if (!this.options.evalScripts) response = response.stripScripts();
        if (receiver = $(receiver)) {
            if (this.options.insertion)
                new this.options.insertion(receiver, response);
            else
                receiver.update(response);
        }
        if (this.success()) {
            if (this.onComplete)
                setTimeout(this.onComplete.bind(this), 10);
        }
    }
});
Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
    initialize: function(container, url, options) {
        this.setOptions(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(request) {
        if (this.options.decay) {
            this.decay = (request.responseText == this.lastText ?
                this.decay * this.options.decay : 1);
            this.lastText = request.responseText;
        }
        this.timer = setTimeout(this.onTimerEvent.bind(this),
            this.decay * this.frequency * 1000);
    },
    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 (typeof element == 'string')
        element = document.getElementById(element);
    return Element.extend(element);
}
if (Prototype.BrowserFeatures.XPath) {
    document._getElementsByXPath = function(expression, parentElement) {
        var results = [];
        var query = document.evaluate(expression, $(parentElement) || document,
            null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        for (var i = 0, length = query.snapshotLength; i < length; i++)
            results.push(query.snapshotItem(i));
        return results;
    };
}
document.getElementsByClassName = function(className, parentElement) {
    if (Prototype.BrowserFeatures.XPath) {
        var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
        return document._getElementsByXPath(q, parentElement);
    } else {
        var children = ($(parentElement) || document.body).getElementsByTagName('*');
        var elements = [], child;
        for (var i = 0, length = children.length; i < length; i++) {
            child = children[i];
            if (Element.hasClassName(child, className))
                elements.push(Element.extend(child));
        }
        return elements;
    }
};
if (!window.Element)
    var Element = new Object();
Element.extend = function(element) {
    if (!element || _nativeExtensions || element.nodeType == 3) return element;
    if (!element._extended && element.tagName && element != window) {
        var methods = Object.clone(Element.Methods), cache = Element.extend.cache;
        if (element.tagName == 'FORM')
            Object.extend(methods, Form.Methods);
        if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))
            Object.extend(methods, Form.Element.Methods);
        Object.extend(methods, Element.Methods.Simulated);
        for (var property in methods) {
            var value = methods[property];
            if (typeof value == 'function' && !(property in element))
                element[property] = cache.findOrStore(value);
        }
    }
    element._extended = true;
    return element;
};
Element.extend.cache = {
    findOrStore: function(value) {
        return this[value] = this[value] || function() {
            return value.apply(null, [this].concat($A(arguments)));
        }
    }
};
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, html) {
        html = typeof html == 'undefined' ? '' : html.toString();
        $(element).innerHTML = html.stripScripts();
        setTimeout(function() {
            html.evalScripts()
        }, 10);
        return element;
    },
    replace: function(element, html) {
        element = $(element);
        html = typeof html == 'undefined' ? '' : html.toString();
        if (element.outerHTML) {
            element.outerHTML = html.stripScripts();
        } else {
            var range = element.ownerDocument.createRange();
            range.selectNodeContents(element);
            element.parentNode.replaceChild(
                range.createContextualFragment(html.stripScripts()), element);
        }
        setTimeout(function() {
            html.evalScripts()
        }, 10);
        return element;
    },
    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 $A($(element).getElementsByTagName('*'));
    },
    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 = $(element);
        return element.previousSiblings().reverse().concat(element.nextSiblings());
    },
    match: function(element, selector) {
        if (typeof selector == 'string')
            selector = new Selector(selector);
        return selector.match($(element));
    },
    up: function(element, expression, index) {
        return Selector.findElement($(element).ancestors(), expression, index);
    },
    down: function(element, expression, index) {
        return Selector.findElement($(element).descendants(), expression, index);
    },
    previous: function(element, expression, index) {
        return Selector.findElement($(element).previousSiblings(), expression, index);
    },
    next: function(element, expression, index) {
        return Selector.findElement($(element).nextSiblings(), expression, index);
    },
    getElementsBySelector: function() {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element, args);
    },
    getElementsByClassName: function(element, className) {
        return document.getElementsByClassName(className, element);
    },
    readAttribute: function(element, name) {
        element = $(element);
        if (document.all && !window.opera) {
            var t = Element._attributeTranslations;
            if (t.values[name]) return t.values[name](element, name);
            if (t.names[name])  name = t.names[name];
            var attribute = element.attributes[name];
            if(attribute) return attribute.nodeValue;
        }
        return element.getAttribute(name);
    },
    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 = $(element))) return;
        var elementClassName = element.className;
        if (elementClassName.length == 0) return false;
        if (elementClassName == className ||
            elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
            return true;
        return false;
    },
    addClassName: function(element, className) {
        if (!(element = $(element))) return;
        Element.classNames(element).add(className);
        return element;
    },
    removeClassName: function(element, className) {
        if (!(element = $(element))) return;
        Element.classNames(element).remove(className);
        return element;
    },
    toggleClassName: function(element, className) {
        if (!(element = $(element))) return;
        Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
        return element;
    },
    observe: function() {
        Event.observe.apply(Event, arguments);
        return $A(arguments).first();
    },
    stopObserving: function() {
        Event.stopObserving.apply(Event, arguments);
        return $A(arguments).first();
    },
    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 $(element).innerHTML.match(/^\s*$/);
    },
    descendantOf: function(element, ancestor) {
        element = $(element), ancestor = $(ancestor);
        while (element = element.parentNode)
            if (element == ancestor) return true;
        return false;
    },
    scrollTo: function(element) {
        element = $(element);
        var pos = Position.cumulativeOffset(element);
        window.scrollTo(pos[0], pos[1]);
        return element;
    },
    getStyle: function(element, style) {
        element = $(element);
        if (['float','cssFloat'].include(style))
            style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');
        style = style.camelize();
        var value = element.style[style];
        if (!value) {
            if (document.defaultView && document.defaultView.getComputedStyle) {
                var css = document.defaultView.getComputedStyle(element, null);
                value = css ? css[style] : null;
            } else if (element.currentStyle) {
                value = element.currentStyle[style];
            }
        }
        if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))
            value = element['offset'+style.capitalize()] + 'px';
        if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
            if (Element.getStyle(element, 'position') == 'static') value = 'auto';
        if(style == 'opacity') {
            if(value) return parseFloat(value);
            if(value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
                if(value[1]) return parseFloat(value[1]) / 100;
            return 1.0;
        }
        return value == 'auto' ? null : value;
    },
    setStyle: function(element, style) {
        element = $(element);
        for (var name in style) {
            var value = style[name];
            if(name == 'opacity') {
                if (value == 1) {
                    value = (/Gecko/.test(navigator.userAgent) &&
                        !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;
                    if(/MSIE/.test(navigator.userAgent) && !window.opera)
                        element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
                } else if(value === '') {
                    if(/MSIE/.test(navigator.userAgent) && !window.opera)
                        element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
                } else {
                    if(value < 0.00001) value = 0;
                    if(/MSIE/.test(navigator.userAgent) && !window.opera)
                        element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'') +
                        'alpha(opacity='+value*100+')';
                }
            } else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';
            element.style[name.camelize()] = value;
        }
        return element;
    },
    getDimensions: function(element) {
        element = $(element);
        var display = $(element).getStyle('display');
        if (display != 'none' && display != null)
            return {
                width: element.offsetWidth,
                height: element.offsetHeight
            };
        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';
            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.style.overflow || 'auto';
        if ((Element.getStyle(element, 'overflow') || 'visible') != '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;
    }
};
Object.extend(Element.Methods, {
    childOf: Element.Methods.descendantOf
});
Element._attributeTranslations = {};
Element._attributeTranslations.names = {
    colspan:   "colSpan",
    rowspan:   "rowSpan",
    valign:    "vAlign",
    datetime:  "dateTime",
    accesskey: "accessKey",
    tabindex:  "tabIndex",
    enctype:   "encType",
    maxlength: "maxLength",
    readonly:  "readOnly",
    longdesc:  "longDesc"
};
Element._attributeTranslations.values = {
    _getAttr: function(element, attribute) {
        return element.getAttribute(attribute, 2);
    },
    _flag: function(element, attribute) {
        return $(element).hasAttribute(attribute) ? attribute : null;
    },
    style: function(element) {
        return element.style.cssText.toLowerCase();
    },
    title: function(element) {
        var node = element.getAttributeNode('title');
        return node.specified ? node.nodeValue : null;
    }
};
Object.extend(Element._attributeTranslations.values, {
    href: Element._attributeTranslations.values._getAttr,
    src:  Element._attributeTranslations.values._getAttr,
    disabled: Element._attributeTranslations.values._flag,
    checked:  Element._attributeTranslations.values._flag,
    readonly: Element._attributeTranslations.values._flag,
    multiple: Element._attributeTranslations.values._flag
});
Element.Methods.Simulated = {
    hasAttribute: function(element, attribute) {
        var t = Element._attributeTranslations;
        attribute = t.names[attribute] || attribute;
        return $(element).getAttributeNode(attribute).specified;
    }
};
if (document.all && !window.opera){
    Element.Methods.update = function(element, html) {
        element = $(element);
        html = typeof html == 'undefined' ? '' : html.toString();
        var tagName = element.tagName.toUpperCase();
        if (['THEAD','TBODY','TR','TD'].include(tagName)) {
            var div = document.createElement('div');
            switch (tagName) {
                case 'THEAD':
                case 'TBODY':
                    div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
                    depth = 2;
                    break;
                case 'TR':
                    div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
                    depth = 3;
                    break;
                case 'TD':
                    div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
                    depth = 4;
            }
            $A(element.childNodes).each(function(node){
                element.removeChild(node)
            });
            depth.times(function(){
                div = div.firstChild
            });
            $A(div.childNodes).each(
                function(node){
                    element.appendChild(node)
                });
        } else {
            element.innerHTML = html.stripScripts();
        }
        setTimeout(function() {
            html.evalScripts()
        }, 10);
        return element;
    }
};
Object.extend(Element, Element.Methods);
var _nativeExtensions = false;
if(/Konqueror|Safari|KHTML/.test(navigator.userAgent))
    ['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {
        var className = 'HTML' + tag + 'Element';
        if(window[className]) return;
        var klass = window[className] = {};
        klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;
    });
Element.addMethods = function(methods) {
    Object.extend(Element.Methods, methods || {});
    function copy(methods, destination, onlyIfAbsent) {
        onlyIfAbsent = onlyIfAbsent || false;
        var cache = Element.extend.cache;
        for (var property in methods) {
            var value = methods[property];
            if (!onlyIfAbsent || !(property in destination))
                destination[property] = cache.findOrStore(value);
        }
    }
    if (typeof HTMLElement != 'undefined') {
        copy(Element.Methods, HTMLElement.prototype);
        copy(Element.Methods.Simulated, HTMLElement.prototype, true);
        copy(Form.Methods, HTMLFormElement.prototype);
        [HTMLInputElement, HTMLTextAreaElement, HTMLSelectElement].each(function(klass) {
            copy(Form.Element.Methods, klass.prototype);
        });
        _nativeExtensions = true;
    }
}
var Toggle = new Object();
Toggle.display = Element.toggle;
Abstract.Insertion = function(adjacency) {
    this.adjacency = adjacency;
}
Abstract.Insertion.prototype = {
    initialize: function(element, content) {
        this.element = $(element);
        this.content = content.stripScripts();
        if (this.adjacency && this.element.insertAdjacentHTML) {
            try {
                this.element.insertAdjacentHTML(this.adjacency, this.content);
            } catch (e) {
                var tagName = this.element.tagName.toUpperCase();
                if (['TBODY', 'TR'].include(tagName)) {
                    this.insertContent(this.contentFromAnonymousTable());
                } else {
                    throw e;
                }
            }
        } else {
            this.range = this.element.ownerDocument.createRange();
            if (this.initializeRange) this.initializeRange();
            this.insertContent([this.range.createContextualFragment(this.content)]);
        }
        setTimeout(function() {
            content.evalScripts()
        }, 10);
    },
    contentFromAnonymousTable: function() {
        var div = document.createElement('div');
        div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
        return $A(div.childNodes[0].childNodes[0].childNodes);
    }
}
var Insertion = new Object();
Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
    initializeRange: function() {
        this.range.setStartBefore(this.element);
    },
    insertContent: function(fragments) {
        fragments.each((function(fragment) {
            this.element.parentNode.insertBefore(fragment, this.element);
        }).bind(this));
    }
});
Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
    initializeRange: function() {
        this.range.selectNodeContents(this.element);
        this.range.collapse(true);
    },
    insertContent: function(fragments) {
        fragments.reverse(false).each((function(fragment) {
            this.element.insertBefore(fragment, this.element.firstChild);
        }).bind(this));
    }
});
Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
    initializeRange: function() {
        this.range.selectNodeContents(this.element);
        this.range.collapse(this.element);
    },
    insertContent: function(fragments) {
        fragments.each((function(fragment) {
            this.element.appendChild(fragment);
        }).bind(this));
    }
});
Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
    initializeRange: function() {
        this.range.setStartAfter(this.element);
    },
    insertContent: function(fragments) {
        fragments.each((function(fragment) {
            this.element.parentNode.insertBefore(fragment,
                this.element.nextSibling);
        }).bind(this));
    }
});
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);
var Selector = Class.create();
Selector.prototype = {
    initialize: function(expression) {
        this.params = {
            classNames: []
        };
        this.expression = expression.toString().strip();
        this.parseExpression();
        this.compileMatcher();
    },
    parseExpression: function() {
        function abort(message) {
            throw 'Parse error in selector: ' + message;
        }
        if (this.expression == '')  abort('empty expression');
        var params = this.params, expr = this.expression, match, modifier, clause, rest;
        while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {
            params.attributes = params.attributes || [];
            params.attributes.push({
                name: match[2],
                operator: match[3],
                value: match[4] || match[5] || ''
            });
            expr = match[1];
        }
        if (expr == '*') return this.params.wildcard = true;
        while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {
            modifier = match[1], clause = match[2], rest = match[3];
            switch (modifier) {
                case '#':       params.id = clause; break;
                case '.':       params.classNames.push(clause); break;
                case '':
                case undefined: params.tagName = clause.toUpperCase(); break;
                default:        abort(expr.inspect());
            }
            expr = rest;
        }
        if (expr.length > 0) abort(expr.inspect());
    },
    buildMatchExpression: function() {
        var params = this.params, conditions = [], clause;
        if (params.wildcard)
            conditions.push('true');
        if (clause = params.id)
            conditions.push('element.readAttribute("id") == ' + clause.inspect());
        if (clause = params.tagName)
            conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());
        if ((clause = params.classNames).length > 0)
            for (var i = 0, length = clause.length; i < length; i++)
                conditions.push('element.hasClassName(' + clause[i].inspect() + ')');
        if (clause = params.attributes) {
            clause.each(function(attribute) {
                var value = 'element.readAttribute(' + attribute.name.inspect() + ')';
                var splitValueBy = function(delimiter) {
                    return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';
                }
                switch (attribute.operator) {
                    case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;
                    case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;
                    case '|=':      conditions.push(
                        splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()
                        ); break;
                    case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;
                    case '':
                    case undefined: conditions.push('element.hasAttribute(' + attribute.name.inspect() + ')'); break;
                    default:        throw 'Unknown operator ' + attribute.operator + ' in selector';
                }
            });
        }
        return conditions.join(' && ');
    },
    compileMatcher: function() {
        this.match = new Function('element', 'if (!element.tagName) return false; \
      element = $(element); \
      return ' + this.buildMatchExpression());
    },
    findElements: function(scope) {
        var element;
        if (element = $(this.params.id))
            if (this.match(element))
                if (!scope || Element.childOf(element, scope))
                    return [element];
        scope = (scope || document).getElementsByTagName(this.params.tagName || '*');
        var results = [];
        for (var i = 0, length = scope.length; i < length; i++)
            if (this.match(element = scope[i]))
                results.push(Element.extend(element));
        return results;
    },
    toString: function() {
        return this.expression;
    }
}
Object.extend(Selector, {
    matchElements: function(elements, expression) {
        var selector = new Selector(expression);
        return elements.select(selector.match.bind(selector)).map(Element.extend);
    },
    findElement: function(elements, expression, index) {
        if (typeof expression == 'number') index = expression, expression = false;
        return Selector.matchElements(elements, expression || '*')[index || 0];
    },
    findChildElements: function(element, expressions) {
        return expressions.map(function(expression) {
            return expression.match(/[^\s"]+(?:"[^"]*"[^\s"]+)*/g).inject([null], function(results, expr) {
                var selector = new Selector(expr);
                return results.inject([], function(elements, result) {
                    return elements.concat(selector.findElements(result || element));
                });
            });
        }).flatten();
    }
});
function $$() {
    return Selector.findChildElements(document, $A(arguments));
}
var Form = {
    reset: function(form) {
        $(form).reset();
        return form;
    },
    serializeElements: function(elements, getHash) {
        var data = elements.inject({}, function(result, element) {
            if (!element.disabled && element.name) {
                var key = element.name, value = $(element).getValue();
                if (value != undefined) {
                    if (result[key]) {
                        if (result[key].constructor != Array) result[key] = [result[key]];
                        result[key].push(value);
                    }
                    else result[key] = value;
                }
            }
            return result;
        });
        return getHash ? data : Hash.toQueryString(data);
    }
};
Form.Methods = {
    serialize: function(form, getHash) {
        return Form.serializeElements(Form.getElements(form), getHash);
    },
    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().each(function(element) {
            element.blur();
            element.disabled = 'true';
        });
        return form;
    },
    enable: function(form) {
        form = $(form);
        form.getElements().each(function(element) {
            element.disabled = '';
        });
        return form;
    },
    findFirstElement: function(form) {
        return $(form).getElements().find(function(element) {
            return element.type != 'hidden' && !element.disabled &&
            ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
        });
    },
    focusFirstElement: function(form) {
        form = $(form);
        form.findFirstElement().activate();
        return form;
    }
}
Object.extend(Form, Form.Methods);
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 Hash.toQueryString(pair);
            }
        }
        return '';
    },
    getValue: function(element) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        return Form.Element.Serializers[method](element);
    },
    clear: function(element) {
        $(element).value = '';
        return element;
    },
    present: function(element) {
        return $(element).value != '';
    },
    activate: function(element) {
        element = $(element);
        element.focus();
        if (element.select && ( element.tagName.toLowerCase() != 'input' ||
            !['button', 'reset', 'submit'].include(element.type) ) )
            element.select();
        return element;
    },
    disable: function(element) {
        element = $(element);
        element.disabled = true;
        return element;
    },
    enable: function(element) {
        element = $(element);
        element.blur();
        element.disabled = false;
        return element;
    }
}
Object.extend(Form.Element, Form.Element.Methods);
var Field = Form.Element;
var $F = Form.Element.getValue;
Form.Element.Serializers = {
    input: function(element) {
        switch (element.type.toLowerCase()) {
            case 'checkbox':
            case 'radio':
                return Form.Element.Serializers.inputSelector(element);
            default:
                return Form.Element.Serializers.textarea(element);
        }
    },
    inputSelector: function(element) {
        return element.checked ? element.value : null;
    },
    textarea: function(element) {
        return element.value;
    },
    select: function(element) {
        return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
    },
    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) {
        return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
    }
}
Abstract.TimedObserver = function() {}
Abstract.TimedObserver.prototype = {
    initialize: function(element, frequency, callback) {
        this.frequency = frequency;
        this.element   = $(element);
        this.callback  = callback;
        this.lastValue = this.getValue();
        this.registerCallback();
    },
    registerCallback: function() {
        setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    },
    onTimerEvent: function() {
        var value = this.getValue();
        var changed = ('string' == typeof this.lastValue && 'string' == typeof value
            ? this.lastValue != value : String(this.lastValue) != String(value));
        if (changed) {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    }
}
Form.Element.Observer = Class.create();
Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});
Form.Observer = Class.create();
Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
    getValue: function() {
        return Form.serialize(this.element);
    }
});
Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
    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.bind(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();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});
Form.EventObserver = Class.create();
Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
    getValue: function() {
        return Form.serialize(this.element);
    }
});
if (!window.Event) {
    var Event = new Object();
}
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,
    element: function(event) {
        return event.target || event.srcElement;
    },
    isLeftClick: function(event) {
        return (((event.which) && (event.which == 1)) ||
            ((event.button) && (event.button == 1)));
    },
    pointerX: function(event) {
        return event.pageX || (event.clientX +
            (document.documentElement.scrollLeft || document.body.scrollLeft));
    },
    pointerY: function(event) {
        return event.pageY || (event.clientY +
            (document.documentElement.scrollTop || document.body.scrollTop));
    },
    stop: function(event) {
        if (event.preventDefault) {
            event.preventDefault();
            event.stopPropagation();
        } else {
            event.returnValue = false;
            event.cancelBubble = true;
        }
    },
    findElement: function(event, tagName) {
        var element = Event.element(event);
        while (element.parentNode && (!element.tagName ||
            (element.tagName.toUpperCase() != tagName.toUpperCase())))
        element = element.parentNode;
        return element;
    },
    observers: false,
    _observeAndCache: function(element, name, observer, useCapture) {
        if (!this.observers) this.observers = [];
        if (element.addEventListener) {
            this.observers.push([element, name, observer, useCapture]);
            element.addEventListener(name, observer, useCapture);
        } else if (element.attachEvent) {
            this.observers.push([element, name, observer, useCapture]);
            element.attachEvent('on' + name, observer);
        }
    },
    unloadCache: function() {
        if (!Event.observers) return;
        for (var i = 0, length = Event.observers.length; i < length; i++) {
            Event.stopObserving.apply(this, Event.observers[i]);
            Event.observers[i][0] = null;
        }
        Event.observers = false;
    },
    observe: function(element, name, observer, useCapture) {
        element = $(element);
        useCapture = useCapture || false;
        if (name == 'keypress' &&
            (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
                || element.attachEvent))
            name = 'keydown';
        Event._observeAndCache(element, name, observer, useCapture);
    },
    stopObserving: function(element, name, observer, useCapture) {
        element = $(element);
        useCapture = useCapture || false;
        if (name == 'keypress' &&
            (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
                || element.detachEvent))
            name = 'keydown';
        if (element.removeEventListener) {
            element.removeEventListener(name, observer, useCapture);
        } else if (element.detachEvent) {
            try {
                element.detachEvent('on' + name, observer);
            } catch (e) {}
        }
    }
});
if (navigator.appVersion.match(/\bMSIE\b/))
    Event.observe(window, 'unload', Event.unloadCache, false);
var Position = {
    includeScrollOffsets: false,
    prepare: function() {
        this.deltaX =  window.pageXOffset
        || document.documentElement.scrollLeft
        || document.body.scrollLeft
        || 0;
        this.deltaY =  window.pageYOffset
        || document.documentElement.scrollTop
        || document.body.scrollTop
        || 0;
    },
    realOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.scrollTop  || 0;
            valueL += element.scrollLeft || 0;
            element = element.parentNode;
        } while (element);
        return [valueL, valueT];
    },
    cumulativeOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
        } while (element);
        return [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 == 'relative' || p == 'absolute') break;
            }
        } while (element);
        return [valueL, valueT];
    },
    offsetParent: 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;
    },
    within: function(element, x, y) {
        if (this.includeScrollOffsets)
            return this.withinIncludingScrolloffsets(element, x, y);
        this.xcomp = x;
        this.ycomp = y;
        this.offset = this.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 = this.realOffset(element);
        this.xcomp = x + offsetcache[0] - this.deltaX;
        this.ycomp = y + offsetcache[1] - this.deltaY;
        this.offset = this.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);
    },
    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;
    },
    page: function(forElement) {
        var valueT = 0, valueL = 0;
        var element = forElement;
        do {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;
            if (element.offsetParent==document.body)
                if (Element.getStyle(element,'position')=='absolute') break;
        } while (element = element.offsetParent);
        element = forElement;
        do {
            if (!window.opera || element.tagName=='BODY') {
                valueT -= element.scrollTop  || 0;
                valueL -= element.scrollLeft || 0;
            }
        } while (element = element.parentNode);
        return [valueL, valueT];
    },
    clone: function(source, target) {
        var options = Object.extend({
            setLeft:    true,
            setTop:     true,
            setWidth:   true,
            setHeight:  true,
            offsetTop:  0,
            offsetLeft: 0
        }, arguments[2] || {})
        source = $(source);
        var p = Position.page(source);
        target = $(target);
        var delta = [0, 0];
        var parent = null;
        if (Element.getStyle(target,'position') == 'absolute') {
            parent = Position.offsetParent(target);
            delta = Position.page(parent);
        }
        if (parent == document.body) {
            delta[0] -= document.body.offsetLeft;
            delta[1] -= document.body.offsetTop;
        }
        if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
        if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
        if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
        if(options.setHeight) target.style.height = source.offsetHeight + 'px';
    },
    absolutize: function(element) {
        element = $(element);
        if (element.style.position == 'absolute') return;
        Position.prepare();
        var offsets = Position.positionedOffset(element);
        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';
    },
    relativize: function(element) {
        element = $(element);
        if (element.style.position == 'relative') return;
        Position.prepare();
        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;
    }
}
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
    Position.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 [valueL, valueT];
    }
}
Element.addMethods();