flagsrequired => { editcatalogue => '*' },
}
);
my $is_valid = valid_isbn_checksum($isbn);
my $is_valid = $isbn eq q{} ? 1 : valid_isbn_checksum($isbn);
$template->param( return => $is_valid );
output_html_with_http_headers $cgi, $cookie, $template->output;
};
-