m1_off = new Image();
m1_off.src = "images/m1.gif";
m1_ovr = new Image();
m1_ovr.src = "images/m1s.gif";
m2_off = new Image();
m2_off.src = "images/m2.gif";
m2_ovr = new Image();
m2_ovr.src = "images/m2s.gif";
m3_off = new Image();
m3_off.src = "images/m3.gif";
m3_ovr = new Image();
m3_ovr.src = "images/m3s.gif";
m4_off = new Image();
m4_off.src = "images/m4.gif";
m4_ovr = new Image();
m4_ovr.src = "images/m4s.gif";
m5_off = new Image();
m5_off.src = "images/m5.gif";
m5_ovr = new Image();
m5_ovr.src = "images/m5s.gif";
m6_off = new Image();
m6_off.src = "images/m6.gif";
m6_ovr = new Image();
m6_ovr.src = "images/m6s.gif";
m7_off = new Image();
m7_off.src = "images/m7.gif";
m7_ovr = new Image();
m7_ovr.src = "images/m7s.gif";
m8_off = new Image();
m8_off.src = "images/m8.gif";
m8_ovr = new Image();
m8_ovr.src = "images/m8s.gif";

function on(img)
{
var imgovr = eval(img + "_ovr.src");
document[img].src = imgovr;
}

function off(img)
{
var imgoff = eval(img + "_off.src");
document[img].src = imgoff;
}