self.onerror = null;
<!-- Test, ob Netscape-Browser ab Version 3
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
var version="0"
  if (browserName == "Netscape" && browserVer >= 3 || browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "yes";
  if (version == "yes"){
    willkommenoff = new Image();
    willkommenoff.src = "images/Willkomen_button1.gif";
    willkommenon = new Image();
    willkommenon.src = "images/Willkomen_button2.gif";
    spritzgussoff = new Image();
    spritzgussoff.src = "images/Spritzguss_button1.gif";
    spritzgusson = new Image();
    spritzgusson.src = "images/Spritzguss_button2.gif";
    tauchenoff = new Image();
    tauchenoff.src = "images/Tauchen_button1.gif";
    tauchenon = new Image();
    tauchenon.src = "images/Tauchen_button2.gif";
    konfektionoff = new Image();
    konfektionoff.src = "images/Konfektion_button1.gif";
    konfektionon = new Image();
    konfektionon.src = "images/Konfektion_button2.gif";
    produkteoff = new Image();
    produkteoff.src = "images/Produkte_button1.gif";
    produkteon = new Image();
    produkteon.src = "images/Produkte_button2.gif";
    kontaktoff = new Image();
    kontaktoff.src = "images/Kontakt_button1.gif";
    kontakton = new Image();
    kontakton.src = "images/Kontakt_button2.gif";
    agboff = new Image();
    agboff.src = "images/AGB_button1.gif";
    agbon = new Image();
    agbon.src = "images/AGB_button2.gif";
    aeboff = new Image();
    aeboff.src = "images/AEB_button1.gif";
    aebon = new Image();
    aebon.src = "images/AEB_button2.gif";
    impressumoff = new Image();
    impressumoff.src = "images/Impressum_button1.gif";
    impressumon = new Image();
    impressumon.src = "images/Impressum_button2.gif";
   }

function img_act(imgName){
  if (version == "yes")  {
    imgOn = eval(imgName + "on.src");
    document [imgName].src = imgOn;
  }
}

function img_inact(imgName){
  if (version == "yes"){
    imgOff = eval(imgName + "off.src");
    document [imgName].src = imgOff;
  }
}