wp-postratings timthumbs?

Hello,
I’m trying to get timthumbs to display with wp-postratings
my existing layout/code that has 2 latest posts.

<div class="latestof">   <h2>Latest Additions</h2>
		<ul>
    <?php query_posts('showposts=2'); ?>
    <?php while (have_posts()) : the_post(); ?>
		<li><div class="date"><?php the_time('F jS, Y') ?></div>
		<?php the_title(); ?>
<a title="<?php the_title(); ?>" href="<?php the_permalink(); ?>"><img 

src="<?php bloginfo('template_directory'); ?>/timthumb.php?src=<?php echo 

catch_that_image() ?>&w=180&h=100&zc=1" alt="<?php the_title(); ?>" /></a>
</li>
    <?php endwhile;?>
    </ul></div>

I want to change it to the highest rated posts with thumbnails
Highest rated code:

<?php if (function_exists('get_highest_rated')): ?>
    <ul>
        <?php get_highest_rated('post', 0, 2); ?>
    </ul>
<?php endif; ?>

How can I display the thumbs with my highest rated?
Thanks