diff --git a/source/js/fancy-box.js b/source/js/fancy-box.js
index 3a6511f9f..7f5a01ce7 100644
--- a/source/js/fancy-box.js
+++ b/source/js/fancy-box.js
@@ -8,6 +8,7 @@ $(document).ready(function() {
       $imageWrapLink = $image.wrap('<a href="' + this.getAttribute('src') + '"></a>').parent('a');
     }
     $imageWrapLink.addClass('fancybox');
+    $imageWrapLink.attr('rel', 'group');
     if ($image.attr("alt")) {
       $imageWrapLink.append('<div class="pic-title"><span>' + $image.attr("alt") + '</span></div>');
       $imageWrapLink.attr("title",$image.attr("alt")); //make sure img title tag will show correctly in fancybox