/*  Prototype JavaScript framework, version 1.4.0_pre2
*  (c) 2005 Sam Stephenson <sam@conio.net>
*
*  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
*  against the source tree, available from the Prototype darcs repository. 
*
*  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: '1.4.0_pre2',
emptyFunction: function() {}
}

var Class = {
create: function() {
return function() { 
this.initialize.apply(this, arguments);
}
}
}

var Abstract = new Object();

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

/*
Object.prototype.extend = function(object) {
return Object.extend.apply(this, [this, object]);
}
*/

Function.prototype.bind = function(object) {
var __method = this;
return function() {
return __method.apply(object, arguments);
}
}

Function.prototype.bindAsEventListener = function(object) {
var __method = this;
return function(event) {
return __method.call(object, event || window.event);
}
}

Number.prototype.toColorPart = function() {
var digits = this.toString(16);
if (this < 16) return '0' + digits;
return digits;
}

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

for (var i = 0; i < arguments.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() {
setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},

onTimerEvent: function() {
if (!this.currentlyExecuting) {
try { 
this.currentlyExecuting = true;
this.callback(); 
} finally { 
this.currentlyExecuting = false;
}
}
}
}

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

function $() {
var elements = new Array();

for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);

if (arguments.length == 1) 
return element;

elements.push(element);
}

return elements;
}

if (!Array.prototype.push) {
Array.prototype.push = function() {
var startLength = this.length;
for (var i = 0; i < arguments.length; i++)
this[startLength + i] = arguments[i];
return this.length;
}
}

if (!Function.prototype.apply) {
// Based on code from http://www.youngpup.net/
Function.prototype.apply = function(object, parameters) {
var parameterStrings = new Array();
if (!object)     object = window;
if (!parameters) parameters = new Array();

for (var i = 0; i < parameters.length; i++)
parameterStrings[i] = 'parameters[' + i + ']';

object.__apply__ = this;
var result = eval('object.__apply__(' + 
parameterStrings.join(', ') + ')');
object.__apply__ = null;

return result;
}
}

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

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].nodeValue;
}
});

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

Ajax.Base = function() {};
Ajax.Base.prototype = {
setOptions: function(options) {
this.options = {
method:       'post',
asynchronous: true,
parameters:   ''
}
Object.extend(this.options, options || {});
},

responseIsSuccess: function() {
return this.transport.status == undefined
|| this.transport.status == 0 
|| (this.transport.status >= 200 && this.transport.status < 300);
},

responseIsFailure: function() {
return !this.responseIsSuccess();
}
}

Ajax.Request = Class.create();
Ajax.Request.Events = 
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
initialize: function(url, options) {
this.transport = Ajax.getTransport();
this.setOptions(options);
this.request(url);
},

request: function(url) {
var parameters = this.options.parameters || '';
if (parameters.length > 0) parameters += '&_=';

try {
if (this.options.method == 'get')
url += '?' + parameters;

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

if (this.options.asynchronous) {
this.transport.onreadystatechange = this.onStateChange.bind(this);
setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
}

this.setRequestHeaders();

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

} catch (e) {
}
},

setRequestHeaders: function() {
var requestHeaders = 
['X-Requested-With', 'XMLHttpRequest',
'X-Prototype-Version', Prototype.Version];

if (this.options.method == 'post') {
requestHeaders.push('Content-type', 
'application/x-www-form-urlencoded');

/* Force "Connection: close" for Mozilla browsers to work around
* a bug where XMLHttpReqeuest sends an incorrect Content-length
* header. See Mozilla Bugzilla #246651. 
*/
if (this.transport.overrideMimeType)
requestHeaders.push('Connection', 'close');
}

if (this.options.requestHeaders)
requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);

for (var i = 0; i < requestHeaders.length; i += 2)
this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
},

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

respondToReadyState: function(readyState) {
var event = Ajax.Request.Events[readyState];

if (event == 'Complete')
(this.options['on' + this.transport.status]
|| this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
|| Prototype.emptyFunction)(this.transport);

(this.options['on' + event] || Prototype.emptyFunction)(this.transport);

/* Avoid memory leak in MSIE: clean up the oncomplete event handler */
if (event == 'Complete')
this.transport.onreadystatechange = Prototype.emptyFunction;
}
});

Ajax.Updater = Class.create();
Ajax.Updater.ScriptFragment = '(?:<script.*?>)((\n|.)*?)(?:<\/script>)';

Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
initialize: function(container, url, options) {
this.containers = {
success: container.success ? $(container.success) : $(container),
failure: 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() {
this.updateContent();
onComplete(this.transport);
}).bind(this);

this.request(url);
},

updateContent: function() {
var receiver = this.responseIsSuccess() ?
this.containers.success : this.containers.failure;

var match    = new RegExp(Ajax.Updater.ScriptFragment, 'img');
var response = this.transport.responseText.replace(match, '');
var scripts  = this.transport.responseText.match(match);

if (receiver) {
if (this.options.insertion) {
new this.options.insertion(receiver, response);
} else {
receiver.innerHTML = response;
}
}

if (this.responseIsSuccess()) {
if (this.onComplete)
setTimeout((function() {this.onComplete(
this.transport)}).bind(this), 10);
}

if (this.options.evalScripts && scripts) {
match = new RegExp(Ajax.Updater.ScriptFragment, 'im');
setTimeout((function() {
for (var i = 0; i < scripts.length; i++)
eval(scripts[i].match(match)[1]);
}).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 = 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.onComplete = undefined;
clearTimeout(this.timer);
(this.onComplete || Ajax.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);
}
});

document.getElementsByClassName = function(className) {
var children = document.getElementsByTagName('*') || document.all;
var elements = new Array();

for (var i = 0; i < children.length; i++) {
var child = children[i];
var classNames = child.className.split(' ');
for (var j = 0; j < classNames.length; j++) {
if (classNames[j] == className) {
elements.push(child);
break;
}
}
}

return elements;
}

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

if (!window.Element) {
var Element = new Object();
}

Object.extend(Element, {
toggle: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
element.style.display = 
(element.style.display == 'none' ? '' : 'none');
}
},

hide: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
element.style.display = 'none';
}
},

show: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
element.style.display = '';
}
},

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

getHeight: function(element) {
element = $(element);
return element.offsetHeight; 
},

hasClassName: function(element, className) {
element = $(element);
if (!element)
return;
var a = element.className.split(' ');
for (var i = 0; i < a.length; i++) {
if (a[i] == className)
return true;
}
return false;
},

addClassName: function(element, className) {
element = $(element);
Element.removeClassName(element, className);
element.className += ' ' + className;
},

removeClassName: function(element, className) {
element = $(element);
if (!element)
return;
var newClassName = '';
var a = element.className.split(' ');
for (var i = 0; i < a.length; i++) {
if (a[i] != className) {
if (i > 0)
newClassName += ' ';
newClassName += a[i];
}
}
element.className = newClassName;
},

// removes whitespace-only text node children
cleanWhitespace: function(element) {
var element = $(element);
for (var i = 0; i < element.childNodes.length; i++) {
var node = element.childNodes[i];
if (node.nodeType == 3 && !/\S/.test(node.nodeValue)) 
Element.remove(node);
}
}
});

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;

if (this.adjacency && this.element.insertAdjacentHTML) {
this.element.insertAdjacentHTML(this.adjacency, this.content);
} else {
this.range = this.element.ownerDocument.createRange();
if (this.initializeRange) this.initializeRange();
this.fragment = this.range.createContextualFragment(this.content);
this.insertContent();
}
}
}

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() {
this.element.parentNode.insertBefore(this.fragment, this.element);
}
});

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() {  
this.element.insertBefore(this.fragment, this.element.firstChild);
}
});

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() {
this.element.appendChild(this.fragment);
}
});

Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
initializeRange: function() {
this.range.setStartAfter(this.element);
},

insertContent: function() {
this.element.parentNode.insertBefore(this.fragment, 
this.element.nextSibling);
}
});

var Field = {
clear: function() {
for (var i = 0; i < arguments.length; i++)
$(arguments[i]).value = '';
},

focus: function(element) {
$(element).focus();
},

present: function() {
for (var i = 0; i < arguments.length; i++)
if ($(arguments[i]).value == '') return false;
return true;
},

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

activate: function(element) {
$(element).focus();
$(element).select();
}
}

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

var Form = {
serialize: function(form) {
var elements = Form.getElements($(form));
var queryComponents = new Array();

for (var i = 0; i < elements.length; i++) {
var queryComponent = Form.Element.serialize(elements[i]);
if (queryComponent)
queryComponents.push(queryComponent);
}

return queryComponents.join('&');
},

getElements: function(form) {
var form = $(form);
var elements = new Array();

for (tagName in Form.Element.Serializers) {
var tagElements = form.getElementsByTagName(tagName);
for (var j = 0; j < tagElements.length; j++)
elements.push(tagElements[j]);
}
return elements;
},

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

if (!typeName && !name)
return inputs;

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

return matchingInputs;
},

disable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
element.blur();
element.disabled = 'true';
}
},

enable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
element.disabled = '';
}
},

focusFirstElement: function(form) {
var form = $(form);
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
if (element.type != 'hidden' && !element.disabled) {
Field.activate(element);
break;
}
}
},

reset: function(form) {
$(form).reset();
}
}

Form.Element = {
serialize: function(element) {
var element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializers[method](element);

if (parameter)
return encodeURIComponent(parameter[0]) + '=' + 
encodeURIComponent(parameter[1]);                   
},

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

if (parameter) 
return parameter[1];
}
}

Form.Element.Serializers = {
input: function(element) {
switch (element.type.toLowerCase()) {
case 'submit':
case 'hidden':
case 'password':
case 'text':
return Form.Element.Serializers.textarea(element);
case 'checkbox':  
case 'radio':
return Form.Element.Serializers.inputSelector(element);
}
return false;
},

inputSelector: function(element) {
if (element.checked)
return [element.name, element.value];
},

textarea: function(element) {
return [element.name, element.value];
},

select: function(element) {
var value = '';
if (element.type == 'select-one') {
var index = element.selectedIndex;
if (index >= 0)
value = element.options[index].value || element.options[index].text;
} else {
value = new Array();
for (var i = 0; i < element.length; i++) {
var opt = element.options[i];
if (opt.selected)
value.push(opt.value || opt.text);
}
}
return [element.name, value];
}
}

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

var $F = Form.Element.getValue;

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

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();
if (this.lastValue != value) {
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() {
var elements = Form.getElements(this.element);
for (var i = 0; i < elements.length; i++)
this.registerCallback(elements[i]);
},

registerCallback: function(element) {
if (element.type) {
switch (element.type.toLowerCase()) {
case 'checkbox':  
case 'radio':
element.target = this;
element.prev_onclick = element.onclick || Prototype.emptyFunction;
element.onclick = function() {
this.prev_onclick(); 
this.target.onElementEvent();
}
break;
case 'password':
case 'text':
case 'textarea':
case 'select-one':
case 'select-multiple':
element.target = this;
element.prev_onchange = element.onchange || Prototype.emptyFunction;
element.onchange = function() {
this.prev_onchange(); 
this.target.onElementEvent();
}
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,

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;
}
},

// find the first node with the given tagName, starting from the
// node the event was triggered on; traverses the DOM upwards
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; i < Event.observers.length; i++) {
Event.stopObserving.apply(this, Event.observers[i]);
Event.observers[i][0] = null;
}
Event.observers = false;
},

observe: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;

if (name == 'keypress' &&
((navigator.appVersion.indexOf('AppleWebKit') > 0) 
|| element.attachEvent))
name = 'keydown';

this._observeAndCache(element, name, observer, useCapture);
},

stopObserving: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;

if (name == 'keypress' &&
((navigator.appVersion.indexOf('AppleWebKit') > 0) 
|| element.detachEvent))
name = 'keydown';

if (element.removeEventListener) {
element.removeEventListener(name, observer, useCapture);
} else if (element.detachEvent) {
element.detachEvent('on' + name, observer);
}
}
});

/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);

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;
},

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];
},

// 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 = 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);
},

// 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;
},

clone: function(source, target) {
source = $(source);
target = $(target);
target.style.position = 'absolute';
var offsets = this.cumulativeOffset(source);
target.style.top    = offsets[1] + 'px';
target.style.left   = offsets[0] + 'px';
target.style.width  = source.offsetWidth + 'px';
target.style.height = source.offsetHeight + 'px';
}
}