Index: editors/tinymce.inc
===================================================================
--- editors/tinymce.inc	(revision 12)
+++ editors/tinymce.inc	(working copy)
@@ -461,6 +461,12 @@ function wysiwyg_tinymce_plugins($editor
       'internal' => TRUE,
       'load' => TRUE,
     ),
+    'iframe' => array(
+      'extensions' => array('iframe' => t('Iframe')),
+      'extended_valid_elements' => array('iframe[src|width|height|frameborder|scrolling]'),
+      'load' => FALSE,
+      'internal' => TRUE,
+    ),
     'inlinepopups' => array(
       'path' => $editor['library path'] . '/plugins/inlinepopups',
       'extensions' => array('inlinepopups' => t('Inline popups')),