diff -rupN coresearches/contentsearch.module coresearches_new/contentsearch.module
--- coresearches/contentsearch.module	2008-07-07 22:00:54.000000000 +1000
+++ contentsearch.module	2009-09-22 15:25:43.000000000 +1000
@@ -81,7 +81,7 @@ function contentsearch_update_shutdown()
  */
 function contentsearch_form_alter($form_id, &$form) {
   // Advanced node search form
-  if ($form_id == 'search_form' && arg(1) == 'node' && user_access('use advanced search')) {
+  if ($form_id == 'search_form' && arg(1) == 'contentsearch' && user_access('use advanced search')) {
     // Keyword boxes:
     $form['advanced'] = array(
       '#type' => 'fieldset',