Index: modules/node/node.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.pages.inc,v
retrieving revision 1.55
diff -u -r1.55 node.pages.inc
--- modules/node/node.pages.inc	13 Feb 2009 02:22:09 -0000	1.55
+++ modules/node/node.pages.inc	4 Mar 2009 23:36:10 -0000
@@ -238,12 +238,13 @@
   $form['buttons']['#weight'] = 100;
   $form['buttons']['submit'] = array(
     '#type' => 'submit',
-    '#access' => !variable_get('node_preview', 0) || (!form_get_errors() && isset($form_state['node_preview'])),
+    '#access' => variable_get('node_preview', 0) != 1 || (!form_get_errors() && isset($form_state['node_preview'])),
     '#value' => t('Save'),
     '#weight' => 5,
     '#submit' => array('node_form_submit'),
   );
   $form['buttons']['preview'] = array(
+    '#access' => variable_get('node_preview', 0) != 2,
     '#type' => 'submit',
     '#value' => t('Preview'),
     '#weight' => 10,
Index: modules/node/node.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.admin.inc,v
retrieving revision 1.38
diff -u -r1.38 node.admin.inc
--- modules/node/node.admin.inc	3 Feb 2009 18:55:30 -0000	1.38
+++ modules/node/node.admin.inc	4 Mar 2009 23:36:10 -0000
@@ -46,8 +46,8 @@
     '#type' => 'radios',
     '#title' => t('Preview post'),
     '#default_value' => 0,
-    '#options' => array(t('Optional'), t('Required')),
-    '#description' => t('Must users preview posts before submitting?'),
+    '#options' => array(t('Optional'), t('Required'), t('Disabled')),
+    '#description' => t('Should users preview posts before submitting?'),
   );
 
   return system_settings_form($form, TRUE);