if (document.images) {            // Active Images
            img1on = new Image();
            img1on.src = "img/bt_about_on.gif";

            img1off = new Image();
            img1off.src = "img/bt_about_out.gif";

            img2on = new Image();
            img2on.src = "img/bt_current_on.gif";

            img2off = new Image();
            img2off.src = "img/bt_current_out.gif";

            img3on = new Image();
            img3on.src = "img/bt_video_on.gif";

            img3off = new Image();
            img3off.src = "img/bt_video_out.gif";

            img4on = new Image();
            img4on.src = "img/bt_text_on.gif";

            img4off = new Image();
            img4off.src = "img/bt_text_out.gif";

            img5on = new Image();
            img5on.src = "img/bt_found_on.gif";

            img5off = new Image();
            img5off.src = "img/bt_found_out.gif";

            img6on = new Image();
            img6on.src = "img/bt_ac_on.gif";

            img6off = new Image();
            img6off.src = "img/bt_ac_out.gif";

            img7on = new Image();
            img7on.src = "img/bt_contact_on.gif";

            img7off = new Image();
            img7off.src = "img/bt_contact_out.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");
        }
}