+% my $value = join(', ', &$parser($cgi->param($_)));
+% my $check = $href->{$_}{check};
+% if ( $check && ! &$check($value) ) {
+% $value = join(', ', $cgi->param($_));
+% $error ||= "Illegal ". ($href->{$_}{name}||$_). ": $value";
+% }
+% "$_=$value\n";