if (document.images) {
            img1on = new Image();
            img1on.src = "./images/menu_01b.jpg";
            img2on = new Image();
            img2on.src = "./images/menu_02b.jpg";
            img3on = new Image();
            img3on.src = "./images/menu_03b.jpg";
            img4on = new Image();
            img4on.src = "./images/menu_04b.jpg";
            img5on = new Image();
            img5on.src = "./images/menu_05b.jpg";
			
            img1off = new Image();
            img1off.src = "./images/menu_01.jpg";
            img2off = new Image();
            img2off.src = "./images/menu_02.jpg";
            img3off = new Image();
            img3off.src = "./images/menu_03.jpg";
            img4off = new Image();
            img4off.src = "./images/menu_04.jpg";
            img5off = new Image();
            img5off.src = "./images/menu_05.jpg";
        }


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");
        }
}