$(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');			
	});
});