function __$(id)
{
	return document.getElementById(id);
}

function __attach(domObj, eventName, handler, capture)
{
	if (window.addEventListener)
	{
		if (typeof capture == "undefined") capture = false;
		domObj.addEventListener(eventName, handler, capture);
	}
	else
	{
		domObj.attachEvent("on" + eventName, handler);
	}
}

function __executeClientEvent(eventName, handlerName, param)
{
	if (!handlerName) return;

	handlerName = eval(handlerName);
	handlerName(param);
}

// Simple tag stripping function, only tags, no attributes
String.prototype.stripTags = function()
{
	var result = this;
	var re1 = /<[a-z]*>/gi;
	var re2 = /<\/[a-z]*>/gi;

	result = result.replace(re1, "").replace(re2, "");

	return (result);
};

String.prototype.trim = function()
{
	a = this.replace(/^\s+/, '');
	return a.replace(/\s+$/, '');
};

var __isIE =  navigator.appVersion.match(/MSIE/);
var __userAgent = navigator.userAgent;
var __isFireFox = __userAgent.match(/firefox/i);
var __isFireFoxOld = __isFireFox && (__userAgent.match(/firefox\/2./i) || __userAgent.match(/firefox\/1./i));
var __isFireFoxNew = __isFireFox && !__isFireFoxOld;

function __parseBorderWidth(width)
{
    var res = 0;
    if (typeof(width) == "string" && width != null && width != "" )
	{
        var p = width.indexOf("px");
        if (p >= 0)
		{
			res = parseInt(width.substring(0, p));
        }
        else
		{
     		//do not know how to calculate other values (such as 0.5em or 0.1cm) correctly now
    		//so just set the width to 1 pixel
            res = 1; 
        }
    }
    return res;
}


//returns border width for some element
function __getBorderWidth(element) {
	var res = new Object();
	res.left = 0; res.top = 0; res.right = 0; res.bottom = 0;
	if (window.getComputedStyle) {
		//for Firefox
		var elStyle = window.getComputedStyle(element, null);
		res.left = parseInt(elStyle.borderLeftWidth.slice(0, -2));  
		res.top = parseInt(elStyle.borderTopWidth.slice(0, -2));  
		res.right = parseInt(elStyle.borderRightWidth.slice(0, -2));  
		res.bottom = parseInt(elStyle.borderBottomWidth.slice(0, -2));  
	}
	else {
		//for other browsers
		res.left = __parseBorderWidth(element.style.borderLeftWidth);
		res.top = __parseBorderWidth(element.style.borderTopWidth);
		res.right = __parseBorderWidth(element.style.borderRightWidth);
		res.bottom = __parseBorderWidth(element.style.borderBottomWidth);
	}
   
	return res;
}

//returns absolute position of some element within document
function __findPos(element)
{
	var res = new Object();
	res.x = 0; res.y = 0;
	if (element !== null) {
		res.x = element.offsetLeft;
		res.y = element.offsetTop;
    	
		var offsetParent = element.offsetParent;
		var parentNode = element.parentNode;
		var borderWidth = null;

		while (offsetParent != null) {
			res.x += offsetParent.offsetLeft;
			res.y += offsetParent.offsetTop;
			
			var parentTagName = offsetParent.tagName.toLowerCase();	

			if ((__isIE && parentTagName != "table") || (__isFireFoxNew && parentTagName == "td")) {		    
				borderWidth = __getBorderWidth(offsetParent);
				res.x += borderWidth.left;
				res.y += borderWidth.top;
			}
		    
			if (offsetParent != document.body && offsetParent != document.documentElement) {
				res.x -= offsetParent.scrollLeft;
				res.y -= offsetParent.scrollTop;
			}

			//next lines are necessary to support FireFox problem with offsetParent
   			if (!__isIE) {
    			while (offsetParent != parentNode && parentNode !== null) {
					res.x -= parentNode.scrollLeft;
					res.y -= parentNode.scrollTop;
					
					if (__isFireFoxOld) {
						borderWidth = _getBorderWidth(parentNode);
						res.x += borderWidth.left;
						res.y += borderWidth.top;
					}
    				parentNode = parentNode.parentNode;
    			}    
			}

   			parentNode = offsetParent.parentNode;
    		offsetParent = offsetParent.offsetParent;
		}
	}
    return res;
}

function checkEvent(oEvt)
{
	oEvt=(oEvt) ? oEvt : ( (window.event) ? window.event : null );
	if(oEvt && oEvt.srcElement && !window.opera)
		oEvt.target=oEvt.srcElement;
	return oEvt;
}

function addEvent(objElement, strEventType, ptrEventFunc)
{
	if (objElement.addEventListener)
		objElement.addEventListener(strEventType, ptrEventFunc, false);
	else if (objElement.attachEvent)
		objElement.attachEvent('on' + strEventType, ptrEventFunc);
}

function removeEvent(objElement, strEventType, ptrEventFunc)
{
	if (objElement.removeEventListener) objElement.removeEventListener(strEventType, ptrEventFunc, false);
		else if (objElement.detachEvent) objElement.detachEvent('on' + strEventType, ptrEventFunc);
}

function matchClass( objNode, strCurrClass )
{
	return ( objNode && objNode.className.length && objNode.className.match( new RegExp('(^|\\s+)(' + strCurrClass + ')($|\\s+)') ) );
}

function getElementsByClassNameP(objParentNode, strNodeName, strClassName)
{
	var nodes = objParentNode.getElementsByTagName(strNodeName);
	if(!strClassName){
		return nodes;	
	}
	var nodesWithClassName = [];
	for(var i=0; i<nodes.length; i++){
		if(matchClass( nodes[i], strClassName )){
			//nodesWithClassName.push(nodes[i]);
			nodesWithClassName[nodesWithClassName.length] = nodes[i];
		}	
	}
	return nodesWithClassName;
}

function getMousePosition(e)
{
	if (e.pageX || e.pageY){
		var posX = e.pageX;
		var posY = e.pageY;
	}else if (e.clientX || e.clientY) 	{
		var posX = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
		var posY = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
	}
	return {x:posX, y:posY}	
}