use CGI;

my $cgi = CGI->new();
$cgi->param( 'mode', 'orig' );
print $cgi->hidden( 'mode', 'second arg' ), "\n";
print $cgi->hidden( -name     => 'mode',
                    -default  => 'default', ), "\n";
print $cgi->hidden( -name     => 'mode',
                    -default  => 'forced',
                    -override => 1 ), "\n";
__END__
<input type="hidden" name="mode" value="orig"  />
<input type="hidden" name="mode" value="orig"  />
<input type="hidden" name="mode" value="forced"  />