$(document).ready(function() {
	// Expand only the active menu, which is determined by the class name
	$("#submenu > li > a[@class=expanded] ").find("+ ul").slideToggle("medium");

	// Toggle the selected menu's class and expand or collapse the menu
	$("#submenu > li > a").click(function() {
		$(this).toggleClass("expanded").toggleClass("collapsed").find("+ ul").slideToggle("medium");
	});
});