btn_link = new Array();
btn_link[0] = "images/link_over.gif";
btn_link[1] = "images/link.gif";
btn_link[2] = "images/top_over.gif";
btn_link[3] = "images/top.gif";
btn_link[4] = "images/btn_en_over.gif";
btn_link[5] = "images/btn_en.gif";
btn_link[6] = "images/btn_es_over.gif";
btn_link[7] = "images/btn_es.gif";
btn_link[8] = "images/btn_mapa_over.gif";
btn_link[9] = "images/btn_mapa.gif";
btn_link[10] = "images/link-black_over.gif";
btn_link[11] = "images/link-black.gif";

link = new Array();
if (document.images) {
	for (i=0; i < btn_link.length; i++) {
	link [i] = new Image();
	link [i].src = btn_link[i];
	}
}

function highlightLink(num, imgname) {
	if (document.images) {
	document[imgname].src = link[num].src;
	}
}