function correctPNG() // correctly handle PNG transparency in Win IE 5.5 or higher.

   {

   for(var i=0; i<document.images.length; i++)

      {

      var img = document.images[i]

      var imgName = img.src.toUpperCase()

      if (imgName.substring(imgName.length-3, imgName.length) == "PNG")

         {

         var imgID = (img.id) ? "id='" + img.id + "' " : ""

         var imgClass = (img.className) ? "class='" + img.className + "' " : ""

         var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "

         var imgStyle = "display:inline-block;" + img.style.cssText

         var imgAttribs = img.attributes;

         for (var j=0; j<imgAttribs.length; j++)

            {

            var imgAttrib = imgAttribs[j];

            if (imgAttrib.nodeName == "align")

               {

               if (imgAttrib.nodeValue == "left") imgStyle = "float:left;" + imgStyle

               if (imgAttrib.nodeValue == "right") imgStyle = "float:right;" + imgStyle

               break

               }

            }

         var strNewHTML = "<span " + imgID + imgClass + imgTitle

         strNewHTML += " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"

         strNewHTML += "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"

         strNewHTML += "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"

         img.outerHTML = strNewHTML

         i = i-1

         }

      }

   }

window.attachEvent("onload", correctPNG);

                var timer = null;
                function zeige_menu() {
                   document.getElementById('menu').style.display='block';
                   document.getElementById('menu_tab').style.display='none';
                }

                function verstecke_menu() {
                   document.getElementById('menu').style.display='none';
                   document.getElementById('menu_tab').style.display='block';
                }

<!--
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 MM_findObj(n, d) { //v4.0
  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 && document.getElementById) x=document.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; }
}

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_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];}
}