(function($){ 
     $.fn.extend({  
         accordion: function() {       
            return this.each(function() {
        if($(this).data('accordiated'))
          return false;                 
        $.each($(this).find('ul, li>div.demo-content'), 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);