// Findet die absolute x Position eines Elementes raus
function getAbsoluteX (elm) {
   var x = 0;
   if (elm && typeof elm.offsetParent != "undefined") {
     while (elm && typeof elm.offsetLeft == "number") {
       x += elm.offsetLeft;
       elm = elm.offsetParent;
     }
   }
   return x;
}


// Findet die absolute y Position eines Elementes raus
function getAbsoluteY(elm){
   var y = 0;
   if (elm && typeof elm.offsetParent != "undefined") {
     while (elm && typeof elm.offsetTop == "number") {
       y += elm.offsetTop;
       elm = elm.offsetParent;
     }
   }
   return y;
}

function getDocHeight() {
    var D = document;
    return Math.max(
        Math.max(D.body.scrollHeight, D.documentElement.scrollHeight),
        Math.max(D.body.offsetHeight, D.documentElement.offsetHeight),
        Math.max(D.body.clientHeight, D.documentElement.clientHeight)
    );
}


function moveRandomImage() {
	var elm = document.getElementById("footer");
	var yPosFooter = getAbsoluteY(elm);

	var elm = document.getElementById("tierbilder");
	//var xPos = getAbsoluteX(elm);
	var yPos = getAbsoluteY(elm);

  	if(yPosFooter > 760)
  	{
		document.getElementById ('tierbilder').style.position = "absolute";
		document.getElementById ('tierbilder').style.top = (yPosFooter-160)+"px";
	}
	
}