$(function(){
            (function($){
                $.fn.accordion = function(custom) {
                    var defaults = {
                        keepOpen: false,
                        startingOpen: false
                    }
                    var settings = $.extend({}, defaults, custom);
                    if(settings.startingOpen){
                        $(settings.startingOpen).show();
                    }
                    return this.each(function(){
                        var obj = $(this);
                        $('li a', obj).click(function(event){
                             
                            var elem = $(this).next();
                            if(elem.is('ul')){
                                event.preventDefault();
                              
                                /*if(!settings.keepOpen){
                                    obj.find('ul:visible').not(elem).not(elem.parents('ul:visible')).slideUp();
                                }*/

                                    elem.slideToggle();

                            }
                          
                            /*if($('ul', obj).css('display','block')){
                                    $('ul li', obj).removeClass('cerrado');
                                    $('ul li', obj).addClass('abierto');
                                }else{
                                    $('ul li', obj).removeClass('abierto');
                                    $('ul li', obj).addClass('cerrado');
                            }  */
                        });
                        
                    });
                };
            })(jQuery);
            $('#categorias').accordion({keepOpen:false, startingOpen: '.open'});
        });