if (document.images) {
            img0on = new Image();   img0on.src = "assets/nav/logob.gif";
            img0off = new Image();  img0off.src = "assets/nav/logoa.gif";
            img1on = new Image();   img1on.src = "assets/nav/nav1b.gif";
            img1off = new Image();  img1off.src = "assets/nav/nav1a.gif";
            img2on = new Image();   img2on.src = "assets/nav/nav2b.gif";
            img2off = new Image();  img2off.src = "assets/nav/nav2a.gif";
            img3on = new Image();   img3on.src = "assets/nav/nav3b.gif";
            img3off = new Image();  img3off.src = "assets/nav/nav3a.gif";
            img4on = new Image();   img4on.src = "assets/nav/nav4b.gif";
            img4off = new Image();  img4off.src = "assets/nav/nav4a.gif";
            img5on = new Image();   img5on.src = "assets/nav/nav5b.gif";
            img5off = new Image();  img5off.src = "assets/nav/nav5a.gif";
            img6on = new Image();   img6on.src = "assets/nav/nav6b.gif";
            img6off = new Image();  img6off.src = "assets/nav/nav6a.gif";
            img7on = new Image();   img7on.src = "assets/nav/nav7b.gif";
            img7off = new Image();  img7off.src = "assets/nav/nav7a.gif";
            img9on = new Image();   img9on.src = "assets/nav/navPreb.gif";
            img9off = new Image();  img9off.src = "assets/nav/navPrea.gif";
            img10on = new Image();   img10on.src = "assets/nav/navNexb.gif";
            img10off = new Image();  img10off.src = "assets/nav/navNexa.gif";
}

// Navigation rollovers

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");}}