browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))

        if (browser) {
        navcat1 = new Image(); navcat1.src = "../pix/category/catfrontkarten.jpg";
        navcat2 = new Image(); navcat2.src = "../pix/category/catfrontboosdisp.jpg";
        navcat3 = new Image(); navcat3.src = "../pix/category/catfrontzubehoer.jpg";
        navcat4 = new Image(); navcat4.src = "../pix/category/catfrontsonstiges.jpg";

        navcat1a = new Image(); navcat1a.src = "../pix/category/catfrontkarten1.jpg";
        navcat2a = new Image(); navcat2a.src = "../pix/category/catfrontboosdisp1.jpg";
        navcat3a = new Image(); navcat3a.src = "../pix/category/catfrontzubehoer1.jpg";
        navcat4a = new Image(); navcat4a.src = "../pix/category/catfrontsonstiges1.jpg";
        }
function displayOver(objectName) {
        if ( browser ) {
        imgOn = eval(objectName + "a.src");
        document [objectName].src = imgOn;
        }
}

function displayOut(objectName) {
        if ( browser ) {
        imgOff = eval(objectName + ".src");
        document [objectName].src = imgOff;
        }
}