<!-- 
			
			var check = browserCheck();
			
			function browserCheck() {
				if(document.all) return "IE";
				else if(document.layers) return "NE";
			    else return "W3C";
			}
			
			
			if (document.layers)  {
			     ns = 1; ie = 0; 
			} else {
			     ns = 0; ie = 1;
			     }
				
			
			var i = 1;
			var test = "demo";
			function zeigeEbeneNr(ebene_nr){
			    verbergen(eval('"' + test + i +'"'));
			    zeigen(eval('"' + test + ebene_nr +'"'));
			    i = ebene_nr; 
			    }
			
			
			
			function zeigen(text) {
				if (check=="NE") targetObj = eval("document."+text);
				if (check=="IE") targetObj = eval(text+".style");
				if (check=="W3C") targetObj = eval ("document.getElementById('"+text+"').style");
				targetObj.visibility = "visible"
			}
			
			function verbergen(text) {
				if (check=="NE") targetObj = eval("document."+text);
				if (check=="IE") targetObj = eval(text+".style");
				if (check=="W3C") targetObj = eval ("document.getElementById('"+text+"').style");
				targetObj.visibility = "hidden"
			}

 -->