//browsererkennung
var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 && parseFloat(navigator.appVersion) >= 4&&parseFloat(navigator.appVersion) < 5) ? 1 : 0;
var isMinNS6 = (isMinNS4 && navigator.userAgent.indexOf("Gecko")>=0) ? 1 : 0;
var isMinIE4 = (document.all) ? 1 : 0;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.")) >= 0 ? 1 : 0;
var isDOM = (document.getElementById) ? 1 : 0;

//macht entsprechende container sicht- oder unsichtbar
function zeigeEbene(id){
  if (isMinIE4) document.all[id].style.visibility = "visible" ; 
  if (isMinIE4||isDOM) document.getElementById(id).style.visibility = "visible";
  if (isMinNS4) document.layers[id].visibility = "show";
}

function verbergeEbene(id){
  if (isMinIE4) document.all[id].style.visibility = "hidden";  
  if (isMinIE4||isDOM) document.getElementById(id).style.visibility = "hidden";
  if (isMinNS4) document.layers[id].visibility = "hide";
}

//mouseover-effekte der navigation, buttons
//function to activate images
function hilite(img){
	if (document.images){
	document[img].src=eval(img+"_2.src");
	}
}

//function to deactivate images
function lolite(img){
	if (document.images){
	document[img].src=eval(img+"_1.src");
	}
}