How advanced you think this JavaScript code is?

var opts = {divId:'divMiAccordion',
            displayMode: 'single',
            titleEvent: 'mouseover'
           };

var acc1 = new Accordion(opts);

var acc2 = new Accordion({divId:'divMiAccordion2',
                          displayMode: 'multiple',
                          titleEvent: 'click'});


function Accordion(opciones){

    var self = this;
    this.init = function(){

        this.container = document.getElementById(opciones.divId);
        this.contenedores = this.container.querySelectorAll('div.panel-body');
        this.titulos = this.container.querySelectorAll('h3');
        this.options = opciones;

        for(var i=0; i<this.contenedores.length; i++){

            this.contenedores[i].classList.add('hidden');
        }

        for (var i = 0; i < this.titulos.length; i++) {
            if(this.options.titleEvent === 'click'){
                this.titulos[i].onclick = tituloEvent;
            }
            else{
                this.titulos[i].onmouseover = tituloEvent;
            }
        };
    } //fin init

     this.getId = function(){
        return self.container.id;
     }

function tituloEvent(){

    var tempNode = null;

    if(self.options.displayMode === 'single'){

        for (var i = 0; i < self.titulos.length; i++) {
                tempNode = self.titulos[i].parentNode.nextElementSibling;
                tempNode.classList.add('hidden');                   
            };          
        }

            tempNode = this.parentNode.nextElementSibling;
            if(tempNode.classList.contains('shown')){
                tempNode.classList.add('hidden');           
                tempNode.classList.remove('shown');         
        }
        else{   
            tempNode.classList.add('shown');            
            tempNode.classList.remove('hidden');            
        }       
    }   

    this.init();

} //fin accordion