Index: modules/system/system.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.admin.inc,v
retrieving revision 1.28
diff -u -p -r1.28 system.admin.inc
--- modules/system/system.admin.inc	26 Nov 2007 16:36:43 -0000	1.28
+++ modules/system/system.admin.inc	27 Nov 2007 06:10:30 -0000
@@ -1556,6 +1556,10 @@ function system_site_maintenance_setting
     '#description' => t('Message to show visitors when the site is in off-line mode.')
   );
 
+if (variable_get('site_offline', 0) == '0') {
+    drupal_set_message(t('Operating in on-line mode.'));
+  }
+
   return system_settings_form($form);
 }