$(document).ready(function () {
		$('#accordion li').click(function () {
			//slideup or hide all the Submenu
			$('#accordion li').children('ul').slideUp('fast');	
			//remove all the "Over" class, so that the arrow reset to default
			$('#accordion li > a').each(function () {
				if ($(this).attr('rel')!='') {
					$(this).removeClass($(this).attr('rel') + 'Over');	
				}
			});
			//show the selected submenu
			$(this).children('ul').slideDown('fast');
			//add "Over" class, so that the arrow pointing down
			$(this).children('a').addClass($(this).children('li a').attr('rel') + 'Over');			
		});	
	});