To prevent the following from appearing in your error log:
PHP Warning: mysql_insert_id(): Access denied for user 'root'@'localhost'
Change (in admin/note.php, 2x):
PHP Code:
  $insert_id mysql_insert_id(); 
To:
PHP Code:
  $insert_id $db->Insert_ID(); 
(mysql_insert_id() is deprecated as of PHP 5.5.0)