<?php

add_theme_support( 'post-thumbnails' );

// Get URL of first image in a post
function catch_that_image() {

	global $post, $posts;

	$first_img = '';

	ob_start();
	ob_end_clean();

	$output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
	$first_img = $matches [1] [0];
	
	// no image found display default image instead
	if(empty($first_img)) {
		$first_img = "/images/no-image.jpg";
	}

	return $first_img;
}

?>