if (document.images) {

// STANDARD GIFS
    img0off = new Image();
    img0off.src = "../images/home.gif";
    img1off = new Image();
    img1off.src = "../images/nav1a.gif";
    img2off = new Image();
    img2off.src = "../images/nav2a.gif";
    img3off = new Image();
    img3off.src = "../images/nav3a.gif";
    img4off = new Image();
    img4off.src = "../images/nav4a.gif";
    img5off = new Image();
    img5off.src = "../images/nav5a.gif";
    img6off = new Image();
    img6off.src = "../images/nav6a.gif";
    img7off = new Image();
    img7off.src = "../images/nav7a.gif";

// ROLLOVER GIFS
    img0on = new Image();
    img0on.src = "../images/homeb.gif";
    img1on = new Image();
    img1on.src = "../images/nav1b.gif";
    img2on = new Image();
    img2on.src = "../images/nav2b.gif";
    img3on = new Image();
    img3on.src = "../images/nav3b.gif";
    img4on = new Image();
    img4on.src = "../images/nav4b.gif";
    img5on = new Image();
    img5on.src = "../images/nav5b.gif";
    img6on = new Image();
    img6on.src = "../images/nav6b.gif";
    img7on = new Image();
    img7on.src = "../images/nav7b.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");
        }
}