img1on = new Image();
img1on.src = "images/home1.gif";
img2on = new Image();
img2on.src = "images/mac1.gif";
img3on = new Image();
img3on.src = "images/windows1.gif";
img4on = new Image();
img4on.src = "images/linux1.gif";
img5on = new Image();
img5on.src = "images/clients1.gif";
img6on = new Image();
img6on.src = "images/contact1.gif";
img7on = new Image();
img7on.src = "images/legal1.gif";
img1off = new Image();
img1off.src = "images/home.gif";
img2off = new Image();
img2off.src = "images/mac.gif";
img3off = new Image();
img3off.src = "images/windows.gif";
img4off = new Image();
img4off.src = "images/linux.gif";
img5off = new Image();
img5off.src = "images/clients.gif";
img6off = new Image();
img6off.src = "images/contact.gif";
img7off = new Image();
img7off.src = "images/legal.gif";

function imgActive(imgName) {
document[imgName].src = eval(imgName + "on.src");
}
function imgInactive(imgName) {
document[imgName].src = eval(imgName + "off.src");
}