function submenu(id) {
		var arrSubmenu = new Array("lang_br", "lang_es", "lang_en", "lang_intro");
		var mySubmenu = document.getElementById(id);
		var mySubmenuItem = document.getElementById("submenu_item_"+id);
		
		for (i=0;i<arrSubmenu.length;i++) {
			document.getElementById(arrSubmenu[i]).style["display"] = "none";
		}
		
		mySubmenu.style["display"] = "block";		
	}