my %service_labels = ( display_external_host => 'ExternalHost',
                       display_internal_host => 'InternalHost',
                       display_virtual_host => 'VirtualHost',
                      );
my $subset = [ 'ExternalHost' ];

$cgi->checkbox_group( -name => 'FOO',
			-values => $subset,
			-labels => \%service_labels
			);

##</code><code>##


<INPUT TYPE="checkbox" NAME="FOO" VALUE="ExternalHost">ExternalHost
<INPUT TYPE="checkbox" NAME="FOO" VALUE="VirtualHost">VirtualHost
<INPUT TYPE="checkbox" NAME="FOO" VALUE="InternalHost">InternalHost


##</code><code>##

<INPUT TYPE="checkbox" NAME="FOO" VALUE="display_external_host">ExternalHost