// mouse out : Menu schliessen
function menuOut(layerx) {
	hideLayer(layerx);
}// menuOut

// mouseover : Menu oeffnen
function menuIn(layerx,y) {
	arr = new Array("nav1", "nav2", "nav3", "nav4");
	for (var i=0 ; i<4 ; i++) {
		if (layerx != arr[i]) {
			// Layer verstecken
			document.getElementById(arr[i]).style.visibility='hidden';
		}// if
	}// for
	displayLayer (layerx);
}// menuIn
    
function Is() {
	var agent = navigator.userAgent.toLowerCase();  
	
	this.major = parseInt(navigator.appVersion);  
	this.minor = parseFloat(navigator.appVersion);  
	
	this.ns = ((agent.indexOf('mozilla')!=-1) && (agent.indexOf('spoofer')==-1) && (agent.indexOf('compatible') == -1) );  
	this.ns2 = (this.ns && (this.major == 2)); 
	this.ns3 = (this.ns && (this.major == 3));  
	this.ns4b = (this.ns && (this.minor < 4.04));  
	this.ns4 = (this.ns && (this.major >= 4)); 
	this.ns6 = (this.ns && (this.major >= 6)); 
	
	this.ie = (agent.indexOf('msie') != -1);  
	this.ie3 = (this.ie && (this.major == 2));  
	this.ie4 = (this.ie && (this.major >= 4));  
	this.op3 = (agent.indexOf('opera') != -1); 
	this.ver5m=(this.major >= 5); 
}// Is

var is = new Is();
   
function displayLayer(lname) { 
	vis='visible';
	estr='';
    if (!is.ver5m) {
    	if (is.ie) estr='document.all["'+lname+'"].style.visibility="'+vis+'"';
        if (is.ns6) estr='document.layers.'+lname+'.visibility="'+vis+'"';   
        eval(estr);
    }// if  
    else document.getElementById(lname).style.visibility=vis;
}// displayLayer   
        
function hideLayer(lname) { 
	vis='hidden';
	estr='';   
    if (!is.ver5m) { 
    	if (is.ie) estr='document.all["'+lname+'"].style.visibility="'+vis+'"';   
        if (is.ns6) estr='document.layers.'+lname+'.visibility="'+vis+'"';      
        eval(estr);
    }// if  
    else document.getElementById(lname).style.visibility=vis; 
}// hideLayer
        
if (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion.substring(0,1)) >= 3))
      || ((navigator.appName == "Microsoft Internet  Explorer")&&(parseInt(navigator.appVersion.substring(0,1)) >= 4))) {
      var version=true
}// if