In root:
index.cgi
[cgi-bin] -> contact.pl
[pages]   -> contact.tmpl
          -> topnav.tmpl
          -> thankyou.tmpl

##</code><code>##

INDEX.CGI:
$template = HTML::Template->new(filename => 'pages/contact.tmpl');

CONTACT.TMPL:
<base href="http://132.321.33.321/" />
<tmpl_include name="pages/topnav.tmpl">
<form action="../cgi-bin/contact.pl"...>

TOPNAV.TMPL
...
<li><a href="?p=6">LINKS</a></li>
...

##</code><code>##

$template->param(HOME => $ENV{HOME});
$template->param(PATH => $ENV{PATH});