function zeigeLayer(layerid){
		var layer = document.getElementById(layerid);
		layer.style.visibility = "visible";
		}

	function verbergeLayer(layerid){
		var layer = document.getElementById(layerid);
		layer.style.visibility = "hidden";
		}

	function oeffnenFenster(url){
		window.open(url, "Modul", "width=800,height=400,scrollbars=yes,resizable=no,menubar=no,toolbar=no");
		}

	function oeffnenLink(url){
		window.open(url, "Link", "width=950,height=500,status=yes, scrollbars=yes,resizable=yes,menubar=yes,toolbar=yes");
		}

	function openDocument() { //v3.0
  		var i, args=openDocument.arguments; document.MM_returnValue = false;
  		for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
		}