Index: js/lightbox.js
===================================================================
--- sites/all/modules/lightbox2/js/lightbox.js	(revision 2769)
+++ sites/all/modules/lightbox2/js/lightbox.js	(working copy)
@@ -512,7 +512,8 @@
       else if (Lightbox.isLightframe) {
         $("#lightbox #imageDataContainer").addClass('lightbox2-alt-layout-data');
         var src = Lightbox.imageArray[Lightbox.activeImage][0];
-        $('#frameContainer').html('<iframe id="lightboxFrame" style="display: none;" src="'+src+'"></iframe>');
+        $('#frameContainer').html('<iframe id="lightboxFrame" style="display: none;" src="'+src+'" frameborder="0"></iframe>');
 
         // Enable swf support in Gecko browsers.
         if ($.browser.mozilla && src.indexOf('.swf') != -1) {