? Vertical Tab JavaScript error: http://drupal.org/node/551426
Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.442
diff -u -p -r1.442 form.inc
--- includes/form.inc	13 Mar 2010 22:33:05 -0000	1.442
+++ includes/form.inc	15 Mar 2010 17:49:53 -0000
@@ -2652,10 +2652,17 @@ function form_process_vertical_tabs($ele
  */
 function theme_vertical_tabs($variables) {
   $element = $variables['element'];
-  // Add required JavaScript and Stylesheet.
-  drupal_add_library('system', 'vertical-tabs');
 
-  return '<div class="vertical-tabs-panes">' . $element['#children'] . '</div>';
+  // Return HTML only if at least one of the tabs has been rendered.
+  if (!empty($element['group']['#children'])) {
+    // Add required JavaScript and Stylesheet.
+    drupal_add_library('system', 'vertical-tabs');
+
+    return '<div class="vertical-tabs-panes">' . $element['#children'] . '</div>';
+  }
+  else {
+    return '';
+  }
 }
 
 /**