var backImage = new Array();

backImage[0] = "images/bg_link.jpg";
backImage[1] = "images/bg_link_over.jpg";

function bgOver(divid, whichImage) {
document.getElementById(divid).style.backgroundImage = "url('images/bg_link_over.jpg')";
}
function bgOut(divid, whichImage) {
document.getElementById(divid).style.backgroundImage = "url('images/bg_link.jpg')";
}