(function(jQuery){
     jQuery.fn.extend({  
         accordion: function() {       
            return this.each(function() {
            	
            	var $ul = $(this);
            	
				if($ul.data('accordiated'))
					return false;
													
				$.each($ul.find('ul, li>div'), function(){
					$(this).data('accordiated', true);
					$(this).hide();
				});
				
				$.each($ul.find('a'), function(){
					$(this).click(function(e){
						activate(this);
						return false;
					});
				});
				
				var qs = new Querystring();
				var catId=qs.get ("cat");
				var active = (catId!=null)?$(this).find('a#cat' + catId)[0]:'';

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