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;

##</code><code>##

USING H::T
<input type="checkbox" name="typeofinfo" value="1" <tmpl_if type1>checked </tmpl_if>/> Program<br />
<input type="checkbox" name="typeofinfo" value="2" <tmpl_if type2>checked </tmpl_if>/> Abstracts<br />

PERL:
{
no strict 'subs';
   for my $i (0 .. $#$typeofinfo) {
      $template -> param( type.$typeofinfo->[$i] => 1 )
   }
}
print $template->output;