Integrate Fancybox(http://fancyapps.com/fancybox/) with PACE(http://github.hubspot.com/pace/docs/welcome/)

jquery.fancybox-pace.js

(function(window, document, $) {

  var FANCYBOX_OVERLAY = ".fancybox-overlay";

  $(document).ready(function () {
    var paceLoading = {
      hideLoading: function() {
        Pace.stop();
        $(FANCYBOX_OVERLAY).show();
      },
      showLoading: function() {
        Pace.start();
        $(FANCYBOX_OVERLAY).hide();
      }
    };

    $.extend($.fancybox, paceLoading);
  });

})(window, document, jQuery);