Of course, with HTML::Template you could do stuff like this:

<SELECT name="whaticando">
  <option value="1"> Log off </option>
<TMPL_IF name=Unprivileged>
  <option value="2"> Whistle a tune </option>
</TMPL_IF>
<TMPL_IF name=Privileged>
  <option value="3">Blow my horn</option>
</TMPL_IF>
</SELECT>
[download]

Then in the script:

  if ($privileged){
    $html->param(
                 whaticando => 'Privileged'
                );
  } else {
    $html->param(
                 whaticando => 'Unprivileged'
                );
  }
[download]

This isn't atually a good way to enforce privilege levels. A clever user could post to your script supplying a "3" instead of a "2" for the "whaticando" parameter. You still need to enforce privilege on the server side without reference to what the client gives you. (Other than a cookie, say, which has it's own vulnerabilities similar to the one just given.) But this method let's your presentation vary based on a privilege level. There are probably neater ways to do this than I've shown.