function getRealLeftTop(el) {
	var xPos = el.offsetLeft;
	var yPos = el.offsetTop;
	var tempEl = el.offsetParent;
	while (tempEl != null) {
		xPos += tempEl.offsetLeft;
		yPos += tempEl.offsetTop;
		tempEl = tempEl.offsetParent;
	}
	return new Array(xPos, yPos);
}