Wordpress thumbnail Yardım

<?php get_header(); ?>
<div id="content">
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<div class="post">
<div class="commentcount"><?php comments_popup_link('0', '1', '%'); ?></div>
<div class="title">
<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>
</div>
<div class="entry">
<?php the_content('<p>Devamını okumak için tıklayınız &raquo;</p>'); ?>
<?php the_tags( '
Etiketler: ', ', ', '
'); ?>
</div>
</div>
<?php endwhile; ?>
<?php
if(function_exists('wp_pagenavi')) { wp_pagenavi(); }
else {
?>
<div class="navigation">
<div class="alignleft"><?php next_posts_link('&laquo; Older Entries') ?></div>
<div class="alignright"><?php previous_posts_link('Newer Entries &raquo;') ?></div>
</div>
<? } ?>
<?php else : ?>
<div class="page" >
<h2>Rats... Whatever You Were Looking For Isn't Here!</h2>
<div class="entry">
<p>Sadly, the page that you thought was here ( or used to be here ) is not here anymore. Please hop back to our <a href="<?php echo get_option('home'); ?>">Home Page</a> or try using the search area off to the right to find what you were looking for.</p>
</div>
</div>
<?php endif; ?>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

<img src="<?php $values = get_post_custom_values("resim"); echo $values[0]; ?>" alt="<?php the_title(); ?>" />