if (document.images) {

// Static gif..
    img1off = new Image();
    img1off.src = "images/nav1.gif";
    img2off = new Image();
    img2off.src = "images/nav2.gif";
    img3off = new Image();
    img3off.src = "images/nav3.gif";
    img4off = new Image();
    img4off.src = "images/nav4.gif";
    img5off = new Image();
    img5off.src = "images/nav5.gif";
    img6off = new Image();
    img6off.src = "images/nav6.gif";
    img7off = new Image();
    img7off.src = "images/nav7.gif";
    img8off = new Image();
    img8off.src = "images/nav8.gif";



// Mouseover gif..
    img1on = new Image();
    img1on.src = "images/nav1h.gif";
    img2on = new Image();
    img2on.src = "images/nav2h.gif";
    img3on = new Image();
    img3on.src = "images/nav3h.gif";
    img4on = new Image();
    img4on.src = "images/nav4h.gif";
    img5on = new Image();
    img5on.src = "images/nav5h.gif";
    img6on = new Image();
    img6on.src = "images/nav6h.gif";
    img7on = new Image();
    img7on.src = "images/nav7h.gif";
    img8on = new Image();
    img8on.src = "images/nav8h.gif";

}

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

// Function to 'deactivate' images.
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}