if(document.images) {

img1on = new Image ();
img1on.src = "/rueckblick/mas09/pics/zurueck_over.gif";
img2on = new Image ();
img2on.src = "/rueckblick/mas09/pics/weiter_over.gif";

img1off = new Image ();
img1off.src = "/rueckblick/mas09/pics/zurueck.gif";
img2off = new Image ();
img2off.src = "/rueckblick/mas09/pics/weiter.gif";
}

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

function imgOff(imgName) {
         if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
         }
}
function backlink(){
 window.location.href = window.name;
}