function onLoad(func)
{
	addSimpleEventListener(window,'load',func); //IE7 doesn't support the correct DOMContentLoaded event...no suprise there!
	if (window.addEventListener) window.addEventListener("DOMContentLoaded", func, false);
}

function addSimpleEventListener(el,event,func)
{
	if (el.addEventListener) el.addEventListener(event, func, false);
	else if (el.attachEvent) el.attachEvent('on'+event, func);
}

function removeSimpleEventListener(el,event,func)
{
	if (el.addEventListener) el.removeEventListener(event, func, false);
	else if (el.attachEvent) el.detachEvent('on'+event, func);
}

function objPos(obj)
{
	
	var left = 0;
	var top = 0;
	if ( obj.offsetParent )
	{
		do
		{
			left += obj.offsetLeft;
			top += obj.offsetTop;
		} while ( obj = obj.offsetParent );
	}
	return [left,top];
}

document.getElementsByClassName = function(clsName){
    var retVal = new Array();
    var elements = document.getElementsByTagName("*");
    for(var i = 0;i < elements.length;i++){
        if(elements[i].className.indexOf(" ") >= 0){
            var classes = elements[i].className.split(" ");
            for(var j = 0;j < classes.length;j++){
                if(classes[j] == clsName)
                    retVal.push(elements[i]);
            }
        }
        else if(elements[i].className == clsName)
            retVal.push(elements[i]);
    }
    return retVal;
}