--- guestbook.module_orig	2008-09-02 11:35:21.000000000 +0200
+++ guestbook.module	2008-09-02 11:35:42.000000000 +0200
@@ -393,7 +393,7 @@
   $form['message'] = array(
     '#type' => 'textarea', '#title' => t('Message'),
     '#cols' => 32, '#rows' => GUESTBOOK_TEXTAREA_ROWS, '#description' => $filter_tips, '#required' => TRUE);
-  $form['send'] = array(
+  $form['submit'] = array(
     '#type' => 'submit', '#value' => t('Send'));
   $form['uid'] = array(
     '#type' => 'value', '#value' => $uid);