browsok = (((navigator.appName == "Netscape")
  && (parseInt(navigator.appVersion) >= 3))
  || ((navigator.appName == "Microsoft Internet Explorer")
  && (parseInt(navigator.appVersion)>=3)));
  if(browsok){
    // MouseOn
       imageH1 = new Image(160, 112);
       imageH1.src = "images/Monster_cut_opt.png";

    // MouseOff
       imageH0 = new Image(160, 112);
       imageH0.src = "images/haloweenTaart.jpg";

  }
  function MouseOn(n){
       if(browsok){
            imageON = eval(n + "1.src");
            document [n].src = imageON;
            }
  }
  function MouseOff(n){
       if(browsok){
  imageOFF = eval(n + "0.src");
       document [n].src = imageOFF;
            }
  }