if (document.images) {

// Static gif..
    img0off = new Image();
    img0off.src = "images/nav00.gif";
    img1off = new Image();
    img1off.src = "images/nav01.gif";
    img2off = new Image();
    img2off.src = "images/nav02.gif";
    img3off = new Image();
    img3off.src = "images/nav03.gif";
    img4off = new Image();
    img4off.src = "images/nav04.gif";
    img5off = new Image();
    img5off.src = "images/nav05.gif";



// Mouseover gif..
    img0on = new Image();
    img0on.src = "images/nav00r.gif";
    img1on = new Image();
    img1on.src = "images/nav01r.gif";
    img2on = new Image();
    img2on.src = "images/nav02r.gif";
    img3on = new Image();
    img3on.src = "images/nav03r.gif";
    img4on = new Image();
    img4on.src = "images/nav04r.gif";
    img5on = new Image();
    img5on.src = "images/nav05r.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");
        }
}