if (document.images) {
   img1on = new Image(); img1on.src = "/tassimo/images/common/nav/Header_nav/discover_on.gif";
   img1off = new Image(); img1off.src = "/tassimo/images/common/nav/Header_nav/discover_off.gif";
   img2on = new Image(); img2on.src = "/tassimo/images/common/nav/Header_nav/ddelivery_on.gif";
   img2off = new Image(); img2off.src = "/tassimo/images/common/nav/Header_nav/ddelivery_off.gif";
   img3on = new Image(); img3on.src = "/tassimo/images/common/nav/Header_nav/shop_on.gif";
   img3off = new Image(); img3off.src = "/tassimo/images/common/nav/Header_nav/shop_off.gif";
   img4on = new Image(); img4on.src = "/tassimo/images/common/nav/Header_nav/account_on.gif";
   img4off = new Image(); img4off.src = "/tassimo/images/common/nav/Header_nav/account_off.gif";
   img5on = new Image(); img5on.src = "/tassimo/images/common/nav/Header_nav/community_on.gif";
   img5off = new Image(); img5off.src = "/tassimo/images/common/nav/Header_nav/community_off.gif";
   img6on = new Image(); img6on.src = "/tassimo/images/common/nav/Header_nav/cservice_on.gif";
   img6off = new Image(); img6off.src = "/tassimo/images/common/nav/Header_nav/cservice_off.gif";
   img7on = new Image(); img7on.src = "/tassimo/images/common/nav/Header_nav/slocator_on.gif";
   img7off = new Image(); img7off.src = "/tassimo/images/common/nav/Header_nav/slocator_off.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");
        }
}