function set_img(src, uri) {
	if (src.id.split) {
		id = src.id.split('-');
		if (id.length==3) {
			otype = id[0];
			onum = id[2];
			img = checkForId(otype + '-' + 'img-' + onum);
			img.src = uri; 
		}
	}
}

function menu_rollover(e) {
	if (!e) e = event;
	src = (e.srcElement) ? e.srcElement : this;
	set_img(src, './images/box_on.gif');
}

function menu_rollout(e) {
	if (!e) e = event;
	src = (e.srcElement) ? e.srcElement : this;
	set_img(src, './images/box_off.gif');
}