Post Thumbs plugin question

I’m using the Post Thumbs plugin, and i use this code in my sidebar:

<?php
$posts = get_posts(‘numberposts=6&offset=9&order=DESC’);
foreach($posts as $post) :
setup_postdata($post);
$post_link = tb_post_thumb(true,$post->post_title);
if ( !empty($post_link) ) {
echo ‘‘ . $post_link . ‘‘; }
endforeach;
?>

I want to link each thumb to the entry of the thumb, so something has to put in the href, but i have really no idea what i should put there?