<!--
if (document.images) {

    img1on = new Image();
    img1on.src = "images/nav/about_sel.png";
    img2on = new Image();
    img2on.src = "images/nav/bike_sel.png";
    img3on = new Image();
    img3on.src = "images/nav/how_sel.png";
    img4on = new Image();
    img4on.src = "images/nav/self_sel.png";
    img5on = new Image();
    img5on.src = "images/nav/test_sel.png";
    img6on = new Image();
    img6on.src = "images/nav/contact_sel.png";
    img7on = new Image();
    img7on.src = "images/nav/resources_sel.png";
    img8on = new Image();
    img8on.src = "images/nav/map_sel.png";

    img1off = new Image();
    img1off.src = "images/nav/about.png";
    img2off = new Image();
    img2off.src = "images/nav/bike.png";
    img3off = new Image();
    img3off.src = "images/nav/how.png";
    img4off = new Image();
    img4off.src = "images/nav/self.png";
    img5off = new Image();
    img5off.src = "images/nav/test.png";
    img6off = new Image();
    img6off.src = "images/nav/contact.png";
    img7off = new Image();
    img7off.src = "images/nav/resources.png";
    img8off = new Image();
    img8off.src = "images/nav/map.png";

}

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");
        }
}
//-->