(function($) {
    $.fn.extend({
        accordionMenu: function() {
            return this.each(function() {
                if ($(this).data('accordiated'))
                    return false;
                $.each($(this).find('ul, li>div'), function() {
                    $(this).data('accordiated', true);
                    $(this).hide();
                });
                $.each($(this).find('a:not(.foo)'), function() {
                    $(this).click(function(e) {
                        activate(e.target);
                        return void (0);
                    });
                });

                var active = false;
                if (location.hash)
                    active = $(this).find('a[href=' + location.hash + ']')[0];
                else if ($(this).find('li.current'))
                    active = $(this).find('li.current a')[0];

                if (active) {
                    activate(active, 'toggle', 'parents');
                    $(active).parents().show();
                }

                function activate(el, effect, parents) {
                    $(el)[(parents || 'parent')]('li').toggleClass('active').siblings().removeClass('active').children('ul, div').slideUp('fast');
                    $(el).siblings('ul, div')[(effect || 'slideToggle')]((!effect) ? 'fast' : null);
                }

            });
        }
    });
})(jQuery);