I'd use my favorite module HTML::Template. Untested:

HTML for form1.cgi:

<form action="foo1.pl" method="post">
  <input type="text" name="firstname" />
  <input type="text" name="lastname" />
  <input type="submit" />
</form>
[download]

PERL foo1.pl:

#!/usr/bin/perl
use strict;
use CGI qw /:cgi/;
use HTML::Template;

my $query = new CGI;

$template = HTML::Template->new( filename => 'form2.tmpl' );
$template -> param( firstname => $query->param('firstname'),
                    lastname  => $query->param('lastname') 
                  );

print $template->output;
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HTML form2.tmpl:

<form action="foo2.pl" method="post">
  <input type="text" name="firstname" value="<tmpl_var firstname>" />
  <input type="text" name="lastname" value="<tmpl_var lastname>" />
  <input type="submit" />
</form>
[download]

And if you are using selects, checkboxes, or radio buttons, HTML::FillInForm is great. Hope your father approves.