browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

if (browserVer >= 3) version = "n3";
else version = "n2";

if (version == "n3") {
   schalteroff = new Image(29,32);
   schalteroff.src = "images/logo1.gif";

   schalteron = new Image(29,32);
   schalteron.src = "images/logo2.gif"
   }

function img_act(imgName) {
         if (version == "n3") {
            imgOn = eval("schalteron.src");
            document [imgName].src = imgOn;
            }
         }

function img_inact(imgName) {
         if (version == "n3") {
            imgOff = eval("schalteroff.src");
            document [imgName].src = imgOff ;
            }
         }