<?php
function catch_that_image ($post_id=0, $width=0, $height=0, $img_script='') {
	global $wpdb;
	if($post_id > 0) {

		 // select the post content from the db

		 $sql = 'SELECT post_content FROM ' . $wpdb->posts . ' WHERE id = ' . $wpdb->escape($post_id);
		 $row = $wpdb->get_row($sql);
		 $the_content = $row->post_content;
		 if(strlen($the_content)) {

			  // use regex to find the src of the image

			preg_match("/<img src\=('|\")(.*)('|\") .*( |)\/>/", $the_content, $matches);
			if(!$matches) {
				preg_match("/<img class\=\".*\" title\=\".*\" src\=('|\")(.*)('|\") .*( |)\/>/U", $the_content, $matches);
			}
			$the_image = '';
			$the_image_src = $matches[2];
			$frags = preg_split("/(\"|')/", $the_image_src);
			if(count($frags)) {
				$the_image_src = $frags[0];
			}

			  // if src found, then create a new img tag

			  if(strlen($the_image_src)) {
				   if(strlen($img_script)) {

					    // if the src starts with http/https, then strip out server name

					    if(preg_match("/^(http(|s):\/\/)/", $the_image_src)) {
						     $the_image_src = preg_replace("/^(http(|s):\/\/)/", '', $the_image_src);
						     $frags = split("\/", $the_image_src);
						     array_shift($frags);
						     $the_image_src = '/' . join("/", $frags);
					    }
					    $the_image = '<img alt="" src="' . $img_script . $the_image_src . '" />';
				   }
				   else {
					    $the_image = '<img alt="" src="' . $the_image_src . '" width="' . $width . '" height="' . $height . '" />';
				   }
			  }
			  return $the_image;
		 }
	}
}
?>