Posting a blog post's Thumbnail Image outside of Wordpress install folder

I'm using the following code to pull the blog posts outside the blog install

?php
require('/home/USERNAME/public_html/blog/wp-blog-header.php');
?>
<?php query_posts('showposts=5'); ?>
<?php while (have_posts()) : the_post(); ?>
<h3><a href="<?php the_permalink() ?>" rel="bookmark" title="Read The Entire Post"><?php the_title(); ?></a></h3>
<p><?php the_excerpt(); ?></p>
<?php endwhile;?>

Code (markup):

I want to also pull the thumbnail image out of wordpress too. How can i do that?

Thanks

 

So, thumnail image was use use as a custom field, please confim this

 

Yes, the thumbnail image is a custom field. (Thanks for the help)

 

Someone at a different forum gave me the answer so I thought to post it here for anyone else that might come across this thread:

$post_image = thesis_post_image_info('thumb');
echo $post_image['output'];

Code (markup):