diff -urp taxonomy_similar/taxonomy_similar.module taxonomy_similar2/taxonomy_similar.module
--- taxonomy_similar/taxonomy_similar.module	2007-06-02 16:23:11.000000000 +0200
+++ taxonomy_similar2/taxonomy_similar.module	2007-07-03 16:13:49.000000000 +0200
@@ -105,12 +105,14 @@ function taxonomy_similar_overview($nid 
 
       if (is_array($similars)) {
         foreach ($similars as $similar) {
+          if(!array_key_exists($similar->tid,$terms)){
           $form['taxonomy'][$similar->vid][$similar->tid] = array(
             '#attributes'    => array('style' => 'margin-left: 1.5em;'),
             '#default_value' => 0,
             '#title'         => t('Use similar tag: %name (@matches).', array('%name' => $similar->name, '@matches' => format_plural($similar->count, '1 match', '@count matches'))),
             '#type'          => 'checkbox',
           );
+          }
         }
       }
       else {