<?php
function catch_that_image()
{
     //Gets the link to the first image of the post
     global $post, $posts;
     $first_img = '';
     ob_start();
     ob_end_clean();
     $output = preg_match_all('//i', $post->post_content, $matches);
     $first_img = $matches [1] [0];
     if(empty($first_img))
     {
          $first_img = "/images/default.jpg";
     }
     //Converts the link to the link of the thumbnail of that image
     $explodepoint = explode(".",$first_img);
     $count = count($explodepoint);
     $size = "-150x150";
     $explodepoint[$count-2]= $explodepoint[$count-2]."".$size;
     $thumb_img = implode(".",$explodepoint);
     echo $thumb_img;
}
?>