Index: includes/modal.inc
===================================================================
--- a/includes/modal.inc	(revision 3252)
+++ b/includes/modal.inc	(working copy)
@@ -65,7 +65,7 @@
   );
 
   drupal_add_js($settings, 'setting');
-  drupal_add_js('misc/jquery.form.js');
+  drupal_add_library('system', 'jquery.form');
   drupal_add_js('misc/progress.js');
   drupal_add_js('misc/ajax.js');
   ctools_add_js('modal');