You can change it so that the preview panel appears with your site layout.
Create a new template named my-comments-preview-tpl.php. Insert your page header, sidebar and footer HTML. Then copy the below code into the template.
In the head section of the page:
<?php require 'head-inc.php'; $separator = ($display['form_location']) ? '–' : ''; ?>
In the body section of the page:
<?php
print "
<div id='tb-wrapper'>
<div class='tb-comment'>
<div class='tb-comment-header'>
<div class='tb-author-loc'>
<span class='tb-author'>{$display['form_author']}</span>
$separator
<span class='tb-location'>{$display['form_location']}</span>
</div>
</div>";
if ($config['comment_subject'])
// Show subject line
print "
<div class='tb-comment-subject'><span class='tb-subject-title'>{$lang['subject']}</span> {$display['form_subject']}</div>";
print "
<div class='tb-comment-text'>
{$display['form_textarea']}
</div>
</div>
<br /><br />";
if ($_REQUEST['action'] == 'update') {
require 'comments-edit-form-tpl.php';
} else {
include $config['comments_form_tpl'];
}
print "
</div> <!--end of tb-wrapper -->";
?>
Finally, change the preview panel file name in the admin configuration settings panel.