commentform-loggedin.template:

<a id="nucleus_cf"></a>
<form method="post" action="#nucleus_cf">
  <div class="commentform">
        <%errordiv%>

        <input type="hidden" name="action" value="addcomment" />
        <input type="hidden" name="url" value="<%formdata(destinationurl)%>" />
        <input type="hidden" name="itemid" value="<%itemid%>" />
        <label for="nucleus_cf_body"><%text(_COMMENTFORM_COMMENT)%></label>:
        <br />
        <textarea name="body" class="formfield" cols="40" rows="10" id="nucleus_cf_body"><%formdata(body)%></textarea>
        <br />
        <%text(_COMMENTFORM_YOUARE)%> <%formdata(membername)%>
        <small>(<a href="?action=logout"><%text(_LOGOUT)%></a>)</small>
        <br />
        <input type="submit" value="<%text(_COMMENTFORM_SUBMIT)%>" class="formbutton" />
        <%callback(FormExtra,commentform-loggedin)%>
        <%Smiley(panel)%>
  </div>
</form>