var popup;
  var _top;
  
   function positioniereDiv(_top)
  {
  	popup=window.document.getElementById("popup");
  	popup.style.top=_top+"px";
  }

  function versteckeDiv()
  {
  	
	popup=window.document.getElementById("popup");
  	popup.style.display="none";
	popup.style.filter="alpha(opacity=0)";
		positioniereDiv(-300);
	}