How to group images in fancybox?

Question

JavaScript

I call fancybox in a not quite standard way:

$('a.fancybox').fancybox.on('click', function(){
  var type = ($(this).data('type')) ? $(this).data('type') : 'image';
  $.fancybox({
    href: this.href,
    type: type
  });
  return false;
});

Answer 1

Why such perversion? What's wrong with the standard method?
In general, for grouping, it rel="group"should be registered there at the links to the pictures. Is he there?