// ALL PURPOSE FUNCTIONS

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

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

// ELEMENT CLASS
if(!window.Element) var Element = new Object();
Object.extend(Element, {
	remove : function(element) {
		element = $(element);
		element.parentNode.removeChild(element);
	}, 
	
  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 = '';
    }
  },
  
	nextItem : function(item, nodeName) {
		if (item == null) return
		var next = item.nextSibling
		while (next != null) {
			if (next.nodeName == nodeName) return next
			next = next.nextSibling
		}
		return null
	},

	previousItem : function(item, nodeName) {
		var previous = item.previousSibling
		while (previous != null) {
			if (previous.nodeName == nodeName) return previous
			previous = previous.previousSibling
		}
		return null
	},

	moveBefore : function(item1, item2) {
		var parent = item1.parentNode
		parent.removeChild(item1)
		parent.insertBefore(item1, item2)
	},

	moveAfter : function(item1, item2) {
		var parent = item1.parentNode
		parent.removeChild(item1)
		parent.insertBefore(item1, item2 ? item2.nextSibling : null)
	},
	
	next:function(elem){
		do {
			elem = elem.nextSibling;
		} while (elem && elem.nodeType !=1);
		return elem;
	}
});

// EVENT CLASS
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;
      event.cancelBubble = true;
    }
  },

  // 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.match(/Konqueror|Safari|KHTML/)
        || 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.match(/Konqueror|Safari|KHTML/)
        || 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);

// DOM MANIPULATION FUNCTIONS 
function create(elem){
	return document.createElementNS ? 
	document.createElementNS('http://www.w3.org/1999/xhtml', elem) : 
	document.createElement(elem);
}

function before(parent, before, elem){
	if(elem == null){
		elem = before;
		before = parent;
		parent = before.parentNode;	
	}
	parent.insertBefore(checkElem(elem), before);
}

function append(parent, elem){
	parent.appendChild(checkElem(elem));
}

function checkElem(elem){
	return elem && elem.constructor == String ? 
	document.createTextNode(elem) : elem;
}


// END DOM MANIPULATION

// XHR CLASS

var XHR = {		
	
	setOptions: function(options) {
		if(!options.method) options.method = 'post';				
		return options;
	},
	
	request: function (url, options) {
		var opts = XHR.setOptions(options);			
		var xml;
		
		if(!url) return false;
		if(!opts.method)	{ 
			opts.method = 'post';
		} else {		
			url = (opts.method == 'get') ? url + '?'+opts.parameters : url;			
		}
		try { xml = new XMLHttpRequest(); }
		catch(e) {
			var versions = new Array('MSXML2.XMLHTTP.6.0','MSXML2.XMLHTTP.5.0','MSXML2.HTTP.4.0','MSXML.HTTP.3.0','MSXML2.HTTP','Microsoft.XMLHTTP');
			for(var i=0; i<versions.length && !xml; i++) {
				try { xml = new ActiveXObject(versions[i]); }
				catch(e) {} // ignore potential errors
			}
		}
		if(xml) { // make the request				
			xml.onreadystatechange = function() { XHR.handler(xml.readyState, xml, opts); }
			xml.open(opts.method, url, true);
			if(opts.method == 'post'){				
				xml.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
				xml.setRequestHeader('Content-length', opts.parameters.length);
				xml.setRequestHeader('Connection', 'close');
				xml.send(opts.parameters);
			} else {				
				xml.send(null);
			}
		}
	}, 
	
	handler: function(state, xml, opts) {		
		if(opts.loading) {
			if(state <4) XHR.onLoading(opts.loading);
		}			
		if(state == 4) {
			if(opts.success) {			
				response = xml.responseText								
				eval(opts.success+'(response)');
			}
		}
	},
	
	onLoading: function(callback) {				
		callback = callback+'()';
		eval(callback);		
	},
	
	onSuccess: function(xml) { 
		return xml.responseText;
	}	
};


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;
}

/*
    Written by Jonathan Snook, http://www.snook.ca/jonathan
    Add-ons by Robert Nyman, http://www.robertnyman.com
*/

function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }   
    }
    return (arrReturnElements)
}

function getStyle(elem, name){
    if(elem.style[name]) 
    	return elem.style[name];
    else if (elem.currentStyle) 
    	return elem.currentStyle[name];
    else if (document.defaultView && document.defaultView.getComputedStyle){
    	name = name.replace(/([A-Z])/g, "-&1");
    	name = name.toLowerCase();
    	
    	var s = document.defaultView.getComputedStyle(elem, "");
    	return s && s.getPropertyValue(name);
    } else
    	return null;		
}

function pageX(elem){
	return elem.offsetParent ? elem.offsetLeft + pageX(elem.offsetParent) : elem.offsetLeft;
}

function pageY(elem){
	return elem.offsetParent ? elem.offsetTop + pageY(elem.offsetParent) : elem.offsetTop;
}

function parentX(elem){
	return elem.parentNode === elem.offsetParent ? elem.offsetLeft : pageX(elem)-pageX(elem.parentNode);
}

function parentY(elem){
	return elem.parentNode === elem.offsetParent ? elem.offsetTop : pageY(elem)-pageY(elem.parentNode);
}

function getHeight(elem){
    return parseInt(getStyle(elem, 'height'));
}

function getWidth(elem){
    return parseInt(getStyle(elem, 'width'));
}

function fullHeight(elem){
    if(getStyle(elem, 'display') != 'none')
    	return elem.offsetHeight || getHeight(elem);
    	
    var old = resetCSS(elem, {
    	display:'',
    	visibility:'hidden',
    	position:'absolute'
    });
    var h = elem.clientHeight || getHeight(elem);
    restoreCSS(elem, old);
    return h;
}

function fullWidth(elem){
	if(getStyle(elem, 'display') != 'none')
		return elem.offsetWidth || getWidth(elem);
	
	var old = resetCSS(elem, {
		display : '',
		visibility:'hidden',
		position:'absolute'
	});
	
	var w = elem.clientWidth || getWidth(elem);
	restoreCSS(elem, old);
	return w;
}

function resetCSS(elem, prop){
    var old = {};
    for(var i in prop){
    	old[i] = elem.style[i];
    	elem.style[i] = prop[i];
    }
    
    return old;
}

function restoreCSS(elem, prop){
    for(var i in prop) elem.style[i] = prop[i];
}

function show(elem){
    elem.style.display = elem.$oldDisplay || '';
}

function slideDown(elem, h){
    if(!$(elem)) return false;
    var elem = $(elem);	
    
    
    // IF NO h SPECIFIED, h IS THE FULL POTENTIAL HEIGHT OF ELEMENT. 
    // SET HEIGHT OF ELEMENT TO 0px
	if(!h) h = fullHeight(elem);
    elem.style.height = '0px';

    var regex = new RegExp("(^|\\s)(hidden)(\\s|$)");    
	if(regex.test(elem.className)){
		elem.className = elem.className.replace('hidden', 'show');	
	}	
	   
    for(var i=0; i<=100; i += 10){
    	(function(){
    		var pos = i;
    		setTimeout( function(){
    			elem.style.height = ((pos/100)*h)+"px"
    		}, (pos +1)*10);
    	})();
    }        
}

function slideUp(elem, h){
	if(!$(elem)) return false;
	var elem = $(elem);
	if(!h) h = fullHeight(elem);
	for(var i=100; i>=0; i-=10) {
		(function(){
			var pos = i;
			setTimeout( function(){								
				elem.style.height = (h-((pos/100)*h))+'px'
				$('info').innerHTML = elem.style.height;
			}, (pos+1)*10);
		})();	
	}
	
}

function insertAfter(parent, node, referenceNode) {
	parent.insertBefore(node, referenceNode.nextSibling);
}


function getCookie( name ) {
	var start = document.cookie.indexOf( name + "=" );
	var len = start + name.length + 1;
	if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) {
		return null;
	}
	if ( start == -1 ) return null;
	var end = document.cookie.indexOf( ';', len );
	if ( end == -1 ) end = document.cookie.length;
	return unescape( document.cookie.substring( len, end ) );
}

function setCookie( name, value, expires, path, domain, secure ) {
	var today = new Date();
	today.setTime( today.getTime() );
	if ( expires ) {
		expires = expires * 1000 * 60 * 60 * 24;
	}
	var expires_date = new Date( today.getTime() + (expires) );
	document.cookie = name+'='+escape( value ) +
		( ( expires ) ? ';expires='+expires_date.toGMTString() : '' ) + //expires.toGMTString()
		( ( path ) ? ';path=' + path : '' ) +
		( ( domain ) ? ';domain=' + domain : '' ) +
		( ( secure ) ? ';secure' : '' );
}

function deleteCookie( name, path, domain ) {
	if ( getCookie( name ) ) document.cookie = name + '=' +
			( ( path ) ? ';path=' + path : '') +
			( ( domain ) ? ';domain=' + domain : '' ) +
			';expires=Thu, 01-Jan-1970 00:00:01 GMT';
}


// ============ ADD EVENTS ================ //
function addEvent(obj, evType, fn){
    if (obj.addEventListener) {
        obj.addEventListener(evType, fn, true);
        return true;
    } else if (obj.attachEvent) {
        var r = obj.attachEvent("on"+evType, fn);
        return r;
    } else {
	    return false;
    }
}