function submenu (x) {
	elem = document.getElementById("menu_span");
	var list = new String;
	for (var i = 0; i<sub_ar[x].length; i++) {
		lable = sub_ar[x][i][0].toUpperCase();
		url = sub_ar[x][i][1];
		list += "<a href="+url+">"+lable+"</a>";
	}
	elem.innerHTML = list;
}