browserName = navigator.appName;
browserVer = parseInt ( navigator.appVersion );
version = "n2";
if ( browserName == "Netscape" && browserVer >= 3 ) version = "n3";
if ( browserName == "Microsoft Internet Explorer" && browserVer >=4 ) 
version = "e4";
if ( version == "n3" || version == "e4" ) 
{
  passiv = new Image(1,1);
  passiv.src = "images/blind.gif";

  aktiv = new Image;
  aktiv.src = "images/nav_elementb.gif";
  
  aktivb = new Image;
  aktivb.src = "images/nav_elementw.gif";
}