function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

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) && (agent.indexOf('opera') == -1) && (agent.indexOf('webtv') == -1));
	this.ns2 = (this.ns && (this.major == 2));
	this.ns3 = (this.ns && (this.major == 3));
	this.ns4 = (this.ns && (this.major == 4));
	this.ns6 = (this.ns && (this.major >= 5));
	this.ie = (agent.indexOf("msie") != -1);
	this.ie3 = (this.ie && (this.major < 4));
	this.ie4 = (this.ie && (this.major >= 4));
	this.ie5 = (this.ie && (this.major == 4) && (agent.indexOf("msie 5.0") != -1));
	this.ieX = (this.ie && !this.ie3 && !this.ie4);
}
var is = new Is();
function layerObject(id,position,left,top,visibility) {
	if (is.ie5||is.ns6){
		this.obj = document.getElementById(id).style;
		this.obj.position = position;
		this.obj.left = left;
		this.obj.top = top;
		this.obj.visibility = visibility;
		return this.obj;
	} else if(is.ie4) {
			this.obj = document.all[id].style;
			this.obj.position = position;
			this.obj.left = left;
			this.obj.top = top;
			this.obj.visibility = visibility;
			return this.obj;
		} else if(is.ns4) {
				this.obj = document.layers[id];
				this.obj.position = position;
				this.obj.left = left;
				this.obj.top = top;
				this.obj.visibility = visibility;
				return this.obj;
			} 
}

<!-- //
function layerSetup() {
	centerLyr1 = new layerObject('inhalt','absolute', available_width/2-395,85,'visible');
	centerLyr2 = new layerObject('top','absolute', available_width/2-395,0,'visible');
	centerLyr3 = new layerObject('bg','absolute', available_width/2-395,80,'visible');
	centerLyr4 = new layerObject('popup','absolute', available_width/2,0,'hidden');
}
//-->

function layerSetup() {
	centerLyr1 = new layerObject('bg','absolute', available_width/2-385,0,'visible');
}

function initLayers() {
	if(is.ns4 ||is.ns6) {
		available_width=innerWidth;
		available_height=innerHeight;
		layerSetup();
	} else if(is.ie4 || is.ie5) {
			available_width=document.body.clientWidth;
			available_height=document.body.clientHeight;
			layerSetup();
		}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}