SexyLightBox = Class.refactor(SexyLightBox, {

  options: {
    middleNav: false
  },

  showContent: function(html, size, bg) {
    this.previous(html, size, bg);
    if (this.options.middleNav && this.MostrarNav){
      var left = this.Contenido.getElement('.left-arrow');
      var right = this.Contenido.getElement('.right-arrow');
      left.adopt(this.prev);
      right.adopt(this.next);
//      var marginTop = ((this.Contenido.getElement('.nav').getSize().y >> 1) - 24) + 'px';
//      [ left, right ].each(function(item){
//        item.setStyle('margin-top', marginTop);
//      });
    }
  },

  showNav: function(caption){
    if (this.options.middleNav) return;
    this.previous(caption);
  }

});