function submenuDisplay(ID) {
	var menu = document.getElementById('menu'+ID);
	var submenu = document.getElementById('submenu'+ID);
	if (submenu.style.display == "none") {
		menu.style.backgroundImage = "url(images/submenu_point_open.gif)";
		submenu.style.display = "";
	} else {
		menu.style.backgroundImage = "url(images/submenu_point_close.gif)";
		submenu.style.display = "none";
	}
}