function clean ()
{
  if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt (0)<'5'))
  {
  window.document.b.visibility="hide";
  window.document.m1.visibility="hide";
  window.document.m2.visibility="hide";
  window.document.m3.visibility="hide";
  window.document.m4.visibility="hide";
  return;
  }
 if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
 layers[0].style.visibility='hidden';
 layers[2].style.visibility='hidden';
 layers[4].style.visibility='hidden';
 layers[6].style.visibility='hidden';
 layers[8].style.visibility='hidden';
 return;
}

function menu (i)
{

switch(i)
 {
  case 1:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
      window.document.b.visibility="show";
      window.document.m1.visibility="show";
      window.document.m2.visibility="hide";
      window.document.m3.visibility="hide";
      window.document.m4.visibility="hide";
     return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='visible';
    layers[2].style.visibility='visible';
    layers[4].style.visibility='hidden';
    layers[6].style.visibility='hidden';
    layers[8].style.visibility='hidden';
    return;
   }
  case 2:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
     window.document.b.visibility="show";
     window.document.m1.visibility="hide";
     window.document.m2.visibility="show";
     window.document.m3.visibility="hide";
     window.document.m4.visibility="hide";
     return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='visible';
    layers[2].style.visibility='hidden';
    layers[4].style.visibility='visible';
    layers[6].style.visibility='hidden';
    layers[8].style.visibility='hidden';
    return;
   }
  case 3:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
     window.document.b.visibility="show";
     window.document.m1.visibility="hide";
     window.document.m2.visibility="hide";
     window.document.m3.visibility="show";
     window.document.m4.visibility="hide";
     return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='visible';
    layers[2].style.visibility='hidden';
    layers[4].style.visibility='hidden';
    layers[6].style.visibility='visible';
    layers[8].style.visibility='hidden';
    return;
   }
case 4:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
     window.document.b.visibility="show";
     window.document.m1.visibility="hide";
     window.document.m2.visibility="hide";
     window.document.m3.visibility="hide";
     window.document.m4.visibility="show";
     return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[0].style.visibility='visible';
    layers[2].style.visibility='hidden';
    layers[4].style.visibility='hidden';
    layers[6].style.visibility='hidden';
    layers[8].style.visibility='visible';
    return;
   }
case 5:
      {
       if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
        {
        window.document.b.visibility="show";
        window.document.m1.visibility="hide";
        window.document.m2.visibility="hide";
        window.document.m3.visibility="hide";
        window.document.m4.visibility="hide";
        return;
        }
       if (navigator.appVersion.charAt (0)<'5')
       {
       var layers=document.all.tags ("div");
       }
       else {
       var layers=document.getElementsByTagName("div");
       }
       layers[0].style.visibility='visible';
       layers[2].style.visibility='hidden';
       layers[4].style.visibility='hidden';
       layers[6].style.visibility='hidden';
       layers[8].style.visibility='hidden';
       return;
   }
case 6:
      {
       if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
        {
        window.document.b.visibility="show";
        window.document.m1.visibility="hide";
        window.document.m2.visibility="hide";
        window.document.m3.visibility="hide";
        window.document.m4.visibility="hide";
        return;
        }
       if (navigator.appVersion.charAt (0)<'5')
       {
       var layers=document.all.tags ("div");
       }
       else {
       var layers=document.getElementsByTagName("div");
       }
       layers[0].style.visibility='visible';
       layers[2].style.visibility='hidden';
       layers[4].style.visibility='hidden';
       layers[6].style.visibility='hidden';
       layers[8].style.visibility='hidden';
       return;
   }
 }

}


function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		kontakt_over = newImage("Bilder/metanavi/kontakt-over.jpg");
		presse_over = newImage("Bilder/metanavi/presse-over.jpg");
		impressum_over = newImage("Bilder/metanavi/impressum-over.jpg");
		agb_over = newImage("Bilder/metanavi/agb-over.jpg");
		datenschutz_over = newImage("Bilder/metanavi/datenschutz-over.jpg");
		preloadFlag = true;
	}
}