--- sites/all/modules/ctools/js/modal.js  2009-05-22 17:09:58.000000000 -0400
+++ sites/all/modules/ctools/js/modal.js	2009-05-22 21:22:42.000000000 -0400
@@ -156,11 +156,12 @@ Drupal.CTools.Modal.submitAjaxForm = fun
     // If the form requires uploads, use an iframe instead and add data to
     // the submit to support this and use the proper response.
     if ($(this).attr('enctype') == 'multipart/form-data') {
-      ajaxOptions = {
+      ajaxIframeOptions = {
         success: Drupal.CTools.AJAX.iFrameJsonRespond,
         iframe: true,
         data: {'ctools_multipart': '1'}
-      } + ajaxOptions;
+      };
+      ajaxOptions = jQuery.extend(ajaxOptions, ajaxIframeOptions);
     }
 
     $(this).ajaxSubmit(ajaxOptions);