function getAbsoluteOffset(obj) {
	//returns collection [x,y]
	x=0;
	y=0;
	while (obj.offsetParent!=null) {
		x+=obj.offsetLeft;
		y+=obj.offsetTop;
		obj=obj.offsetParent;
	}
	var retVal = new Array();
	retVal['x']=x;
	retVal['y']=y;
	return retVal;
}
function getYpos(obj) {
	var pos = getAbsoluteOffset(obj);
	return pos['y'];
}function getXpos(obj) {
	var pos = getAbsoluteOffset(obj);
	return pos['x'];
}