jQuery(document).ready(function($) {
	var current;
	$('li.trigger').click(function() {
		$('li.trigger ul').each(function() {
			$(this).css('display', 'none');
		});
		if(current != this) {
			$(this).children().css('display', 'block');
			current = this;
		}
		else {
			current = null;
		}
	});
});