if (isset($addrbook_dsn) && !empty($addrbook_dsn)) {
        /* Database */
        if (!isset($addrbook_table) || empty($addrbook_table)) {
            $addrbook_table = 'address';
        }
        $r = $abook->add_backend('database', Array('dsn' => $addrbook_dsn,
                            'owner' => $username,
                            'table' => $addrbook_table));
        if (!$r && $showerr) {
            $abook_init_error.=_("Error initializing address book database.") .' '. $abook->error;
        }
    } else {
        /* File */
        $filename = getHashedFile($username, $data_dir, "$username.abook");
        $r = $abook->add_backend('local_file', Array('filename' => $filename,
                                                     'line_length' => $abook_file_line_length,
                                                     'create'   => true));
        if(!$r && $showerr) {
            $abook_init_error.=sprintf( _("Error opening file %s"), $filename );
        }
    }