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  1. //Get the first image from the post and display it
  2. function catch_that_image() {
  3.   global $post, $posts;
  4.   $first_img = '';
  5.   ob_start();
  6.   ob_end_clean();
  7.   $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
  8.   $first_img = $matches [1] [0];
  9.  
  10.   if(empty($first_img)){ //Defines a default image
  11.     $first_img = "/images/default.jpg";
  12.   }
  13.   return $first_img;
  14. }
  15.  
  16.  
  17. //call the function within the loop
  18. echo catch_that_image()

URL: http://www.wprecipes.com/how-to-get-the-first-image-from-the-post-and-display-it

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