function changeMenuToSub(menuid) {
		var menu = document.getElementById(menuid);
		var menu_active  = "img/menu_0" + menuid + "_2.gif";
		menu.src = menu_active;
	}

	function changeMenuToDefault(menuid) {
		var menu = document.getElementById(menuid);
		var menu_default = "img/menu_0" + menuid + ".gif";
		menu.src = menu_default;
	}

	function showSubMenu(subMenuId) {
		for(i=1; i<=10; i++) {
			if(document.getElementById("submenu" + i)) {
				
				if (i == subMenuId){
					 document.getElementById("submenu" + i).style.display = "block";
				}
				else {
					document.getElementById("submenu" + i).style.display = "none";
				}
			}
		}
		
	}

	function hideSubMenus() {
		for(i=1; i<=10; i++) {
			document.getElementById("submenu" + i).style.display = "none";
		}
	}