function smenu(id){
	window.name = id;
	var menus = document.getElementById("subnav_top").getElementsByTagName("ul");
	for (var i=0; i<menus.length; i++){
		if (i == id){
			menus[i].style.display = "block";
		} else {
			menus[i].style.display = "none";
		}
	}
}