https://ecousticsystems.com/sites/all/modules/shadowbox/shadowbox_auto.js?v=3.0.3

1(function ($) {
2
3// Check that shadowbox library is available
4if (typeof Shadowbox === 'undefined') return;
5
6Drupal.behaviors.shadowbox = {
7  attach: function(context, settings) {
8    Shadowbox.init(Drupal.settings.shadowbox);
9    if (settings.shadowbox.auto_enable_all_images == 1) {
10      $("a[href$='.jpg'], a[href$='.png'], a[href$='.gif'], a[href$='.jpeg'], a[href$='.bmp'], a[href$='.JPG'], a[href$='.PNG'], a[href$='.GIF'], a[href$='.JPEG'], a[href$='.BMP']").each(function() {
11        if ($(this).attr('rel') == '') {
12          if (settings.shadowbox.auto_gallery == 1) {
13            $(this).attr('rel', 'shadowbox[gallery]');
14          }
15          else {
16            $(this).attr('rel', 'shadowbox');
17          }
18        }
19      });
20    }
21    Shadowbox.clearCache();
22    Shadowbox.setup();
23  }
24};
25
26})(jQuery);