HTML:
<input type="checkbox" name="typeofinfo" value="1" /> Program<br />
<input type="checkbox" name="typeofinfo" value="2" /> Abstracts<br />
<input type="checkbox" name="typeofinfo" value="3" /> Exhibits<br />
<input type="checkbox" name="typeofinfo" value="4" /> Registration<br />

PERL:
$fillinformvalues = { typeofinfo => $query->param('typeofinfo') }
my $form = new HTML::FillInForm;
my $page = $form->fill(
   scalarref  => \$html,
    fdat        => $fillinformvalues );
print $page;