var i = 1;
var schicht = "hp";

var browserName = navigator.appName;
var browserVersion = parseInt(navigator.appVersion);
var isIE = false;
var isNN = false;
var isDOM = false;
var isDomIE = false;
var isDomNN = false;

isIE = browserName.indexOf("Microsoft Internet Explorer" )==-1?false:true;
isNN = browserName.indexOf("Netscape")==-1?false:true;
isDOM = document.getElementById?true:false;

function verbergen(name) {
  if (isDOM) document.getElementById(name).style.visibility="hidden";
  if (isDomIE) document.all[name].style.visibility="hidden";
  if (isDomNN) document.layers[name].visibility="hidden";
}

function zeigen(name) {
  if (isDOM) document.getElementById(name).style.visibility="visible";
  if (isDomIE) document.all[name].style.visibility="visible";
  if (isDomNN) document.layers[name].visibility="visible";
}

function click(num){
verbergen(eval('"' + schicht + i +'"'));
zeigen(eval('"' + schicht + num +'"'));
i = num;
}


function ShowWindow(url, w, h){
	var winWidth  = w ;                         
    var winHeight = h ;
	dummy = window.open(url,"dummy","resizable=yes,scrollbars=yes,toolbars=no,menubars=no,location=no,width="+winWidth+",height="+winHeight);                 
    dummy.moveTo(0,0);
	dummy.focus();	  
}	


<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

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_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->