img0_on = new Image;
img0_on.src="/images/top1_menu0_light.jpg";
img0_off = new Image;
img0_off.src="/images/top1_menu0" + ((dark == 0)?"_dark":"") + ".jpg";

img1_on = new Image;
img1_on.src="/images/top1_menu1_light.jpg";
img1_off = new Image;
img1_off.src="/images/top1_menu1" + ((dark == 1)?"_dark":"") + ".jpg";

img2_on = new Image;
img2_on.src="/images/top1_menu2_light.jpg";
img2_off = new Image;
img2_off.src="/images/top1_menu2" + ((dark == 2)?"_dark":"") + ".jpg";

img3_on = new Image;
img3_on.src="/images/top1_menu3_light.jpg";
img3_off = new Image;
img3_off.src="/images/top1_menu3" + ((dark == 3)?"_dark":"") + ".jpg";

function over_image(parm_name)
    {
        document.images[parm_name].src = eval(parm_name + "_on.src");
    }
function off_image(parm_name)
    {
        document.images[parm_name].src = eval(parm_name + "_off.src");
    }