function getElementPosition(elemId)
{
    var elem = document.getElementById(elemId);
	var w = elem.offsetWidth;
    var h = elem.offsetHeight;
	var l =  0 ;
    var t =  0 ;
	while (elem)
    {
        l += elem.offsetLeft;
        t += elem.offsetTop;
        elem = elem.offsetParent;
    }
    return {"left":l, "top":t, "width":w, "height":h};
}