img1_on = new Image;
img1_on.src="/images/hm1-o.jpg";
img1_off = new Image;
img1_off.src="/images/hm1.jpg";

img2_on = new Image;
img2_on.src="/images/hm2-o.jpg";
img2_off = new Image;
img2_off.src="/images/hm2.jpg";

img3_on = new Image;
img3_on.src="/images/hm3-o.jpg";
img3_off = new Image;
img3_off.src="/images/hm3.jpg";

img4_on = new Image;
img4_on.src="/images/hm4-o.jpg";
img4_off = new Image;
img4_off.src="/images/hm4.jpg";

img5_on = new Image;
img5_on.src="/images/hm5-o.jpg";
img5_off = new Image;
img5_off.src="/images/hm5.jpg";

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