function $(el) {
	return document.getElementById(el);
}

function mover(img) {
	el = $(img);
	el.old_src = el.src;
	el.src = el.src.replace("_off", "_on");
}

function mout(img) {
	el = $(img);
	el.src = el.old_src;
}

function mouseoverinit() {
	if (!document.getElementById) return;

	preloads = new Array();
	imgs = document.getElementsByTagName("img");

	for (i = 0; i < imgs.length; i++) {
		for (j = 0; j < imgs[i].attributes.length; j++) {
			tt = imgs[i].attributes[j].name.toUpperCase();

			if (tt == "SWAP") {
				soff = imgs[i].getAttribute("src");
				son = soff.replace("_off", "_on");

				preloads[i] = new Image();
				preloads[i].src = son;

				imgs[i].onmouseover = new Function("imgs[" + i + "].src='" + son + "'");
				imgs[i].onmouseout = new Function("imgs[" + i + "].src='" + soff + "'");
			}
		}
	}
}

onload=mouseoverinit;