function l2_changecharactername ( $char_id, $new_char_name ) {
  // 4 - ChangeCharacterName, char_id, new_char_name
  $cached_op = pack ( "cV", 4, $char_id );
  $cached_op .= ansi2unicode ( $new_char_name );
  $cached_op .= ansi2unicode ( $_SESSION [ "account" ] );
  $ret_string = l2_cached_push ( pack ( "s", strlen ( $cached_op ) + 2 ) . $cached_op );
  return ( $ret_string );
}