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if ($user) {
  $cgi->start_html;
...
  print "Content-Type: text/html\n\n", $template->output;
  $cgi->end_html;
}

if ($user) {
   print $cgi->header,$cgi->start_html,"Hi there!",
...
     print $cgi->header,$cgi->start_html,
           $template->output,$cgi->end_html;
}