function cat_on(div,category) {
	var img = div.getElementsByTagName("img")[0];
	img.src = wpRoot + "/images/menu/slider_" + category + "_mo.jpg";
}

function cat_off(div,category) {
	var img = div.getElementsByTagName("img")[0];
	img.src = wpRoot + "/images/menu/slider-" + category + ".jpg";
}