There are quite a handful of different post thumbnail solutions out there, but it seems that I found a very simple and compatible one that uses the famous timthumb library.

Add this code to your functions page, functions.php:

function post_image() {
 global $post, $posts;
 $thumb = '';
$output = preg_match_all('/ltimg.src'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
 $thumb = $matches [1] [0];

 if($thumb == '') { //Defines a default image or don't show at all. Use HTML inside the apostrophes.
 return '';
 }
 else {
return '<a href="'.get_permalink($post -> ID).'"><img src="http://www.tots2teens.ie/wp-content/themes/wp-tots/helpers/timthumb.php?src='.$thumb.'&amp;h=100&amp;w=251&amp;zc=1&amp;q=100" alt="" /></a>';
 }
}

Use <?php echo post_image();?> inside a custom defined loop to show the image. I did not bother to create a plugin as the solution is easier to be plugged in directly into functions.php.

See it in action here and here.

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