Including Thumbnails in stats_get_csv Results?

I need some help.

So I’m using this code to return the top posts from my blog:

<?php function get_stats_exclude_home($numDays,$numPosts) {
      $numPostsPlus = $numPosts + 1;
      $blnHasHome = false;
      $intRowsLoop = 0;
      $intRowFound;
      $intRowsCount;
      $most_read_posts;

      $strArgs = 'days=' . $numDays . '&limit=' . $numPostsPlus;

      if (function_exists('stats_get_csv')) {
        $most_read_posts = stats_get_csv('postviews', $strArgs);
      }

      foreach ($most_read_posts as $single_post) {
        $postTitle = $single_post['post_title'];
        if($postTitle == 'Home page') {
          $blnHasHome = true;
          $intRowFound = $intRowsLoop;
        }
        $intRowsLoop = $intRowsLoop + 1;
      }

      $intRowsCount = $intRowsLoop;

      if($blnHasHome) {
        unset($most_read_posts[$intRowFound]);
      } else {
        if($intRowsCount > $numPosts){
          unset($most_read_posts[$numPosts]);
        }
      }

      return $most_read_posts;
    } ?>

And this code to display the results in my theme template:

<?php if ( function_exists('get_stats_exclude_home') && $top_posts = get_stats_exclude_home(1,4) ) : ?>
<?php foreach ( $top_posts as $p ) : ?>
<div class="related">
        <a href="<?php echo $p['post_permalink']; ?>"><?php thumbnail(); ?></a>
        <p><a href="<?php echo $p['post_permalink']; ?>"><?php echo $p['post_title']; ?></a></p>
	</div>

The problem I’m having is in trying to include post_thumbnail functionality.

I believe something along these lines should work??:

$post = get_post($p['post_id']);
if ( !isset($post->post_type) || $post->post_type != 'post' )
    continue;
if ( has_post_thumbnail( $post->ID ) )
    $thumbnail = get_the_post_thumbnail( $post->ID );
else
    $thumbnail = '';

Then I’m stuck on how to display the thumbnail? Any help is greatly appreciated.