function findPos(obj)
	{
	var curleft = curtop = 0;
	if (obj.offsetParent)
		{
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent)
			{
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
			}
		}
	return [curleft,curtop];
	}

function positionierung()
	{
	var contentUnten = findPos(document.getElementById("contBottom"));
	var hintergrund	 = document.getElementById("hintergrundSizer");
	
		hintergrund.style.height = contentUnten[1]-360+"px";
		hintergrund.style.width = "100px";
	}