if (document.images) {
            img1on = new Image();
            img1on.src = "../images/n_menu01b.gif";
            img2on = new Image();
            img2on.src = "../images/n_menu02b.gif";
            img3on = new Image();
            img3on.src = "../images/n_menu03b.gif";
            img4on = new Image();
            img4on.src = "../images/n_menu04b.gif";
            img5on = new Image();
            img5on.src = "../images/n_menu05b.gif";
            img6on = new Image();
            img6on.src = "../images/n_menu06b.gif";
            img7on = new Image();
            img7on.src = "../images/n_menu07b.gif";
            img8on = new Image();
            img8on.src = "../images/n_menu08b.gif";
            img9on = new Image();
            img9on.src = "../images/n_menu09b.gif";
            img10on = new Image();
            img10on.src = "../images/n_menu10b.gif";


            img1off = new Image();
            img1off.src = "../images/n_menu01.gif";
            img2off = new Image();
            img2off.src = "../images/n_menu02.gif";
            img3off = new Image();
            img3off.src = "../images/n_menu03.gif";
            img4off = new Image();
            img4off.src = "../images/n_menu04.gif";
            img5off = new Image();
            img5off.src = "../images/n_menu05.gif";
            img6off = new Image();
            img6off.src = "../images/n_menu06.gif";
            img7off = new Image();
            img7off.src = "../images/n_menu07.gif";
            img8off = new Image();
            img8off.src = "../images/n_menu08.gif";
            img9off = new Image();
            img9off.src = "../images/n_menu09.gif";
            img10off = new Image();
            img10off.src = "../images/n_menu10.gif";
        }


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");
        }
}