//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;

// preloading main navigation-images
if (document.images) { 

img8on=new Image();
img8on.src="images/nav/kontakt_hi.gif";

img9on=new Image();
img9on.src="images/nav/veranstaltungen_hi.gif";

img8off=new Image();
img8off.src="images/nav/kontakt_lo.gif";

img9off=new Image();
img9off.src="images/nav/veranstaltungen_lo.gif";

}

// function to activate images
function imgOn(imgName) {
	if (isDOM) {
	//alert('dom');
	document.getElementById(imgName).src = eval(imgName+"on.src");
	} else {
	//alert('nodom');
	document[imgName].src=eval(imgName+"on.src");
	}
}

// function to deactivate images
function imgOff(imgName) {
	if (isDOM) {
	document.getElementById(imgName).src = eval(imgName+"off.src");
	} else {
	document[imgName].src=eval(imgName+"off.src");
	}
}

// from here: not used yet

//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";
}