function cattag_related_posts(
	$limit = 5,
	$display_posts = true,
	$display_pages = false,
	$before = '<li>',
	$after = '</li>',
	$notfound = false,
	$order = 'DATE_DESC',
	$exclude_ids = ''
) {

	global $wpdb, $post;	// WordPress globals
	$wheres = array();
	$wheres[] = "p.post_status = 'publish'";
	$wheres[] = "p.ID <> $post->ID";

	// *************************************************
	// Prepare selection of posts and pages
	// *************************************************
	if ( ($display_posts === true) AND ($display_pages === true) ) {
		// Display both posts and pages
		// $poststatus = "IN('publish', 'static')";
		$wheres[] = "p.post_type in ('post', 'page')";
	} elseif ( ($display_posts === true) AND ($display_pages === false) ) {
		// Display posts only
		// $poststatus = "= 'publish'";
		$wheres[] = "p.post_type = 'post'";
	} elseif ( ($display_posts === false) AND ($display_pages === true) ) {
		// Display pages only
		// $poststatus = "= 'static'";
		$wheres[] = "p.post_type = 'page'";
	} else {
		// Nothing can be displayed
		return $notfound;
	}

	// *************************************************
	// Prepare exlusion of categories
	// *************************************************
	$exclude_ids = preg_replace('/[^0-9,]/','',$exclude_ids);	// remove everything except 0-9 and comma
	$exclude_ids_sql = '';
	if ($exclude_ids != '') {
		// $exclude_ids_sql = 'AND post2cat.category_id NOT IN(' . $exclude_ids . ')';
	}

	// *************************************************
	// Put the category IDs into a comma-separated string
	// *************************************************
	$catsList = '';
	$count = 0;
	foreach((get_the_category()) as $loop_cat) {
		// Add category id to list
		if ($count == 0) {
			$catsList = $loop_cat->cat_ID;
		} else {
			$catsList = $catsList . ',' . $loop_cat->cat_ID;
		}
		$count++;
	}

	$wheres[] = "tr.term_taxonomy_id in ($catsList)";

	// *************************************************
	// Prepare order
	// *************************************************
	switch (strtoupper($order)) {
		case 'RANDOM':
			$order_by = 'RAND()';
			break;
		default:	// 'DATE_DESC'
			$order_by = 'p.post_date DESC';
	}

	// *************************************************
 	// SQL query. DISTINCT is here for getting a unique result without duplicates
 	// *************************************************
   //	$sql = "SELECT DISTINCT posts.ID, posts.post_title
   //		FROM $wpdb->posts posts, $wpdb->post2cat post2cat
   //		WHERE posts.ID <> $post->ID
   //		AND posts.post_status $poststatus
   //		AND posts.ID = post2cat.post_id
   //		AND post2cat.category_id IN($catsList)
   //		$exclude_ids_sql
   //		ORDER BY $order_by
   //		LIMIT $limit";
   $sql = "SELECT DISTINCT p.ID, p.post_title FROM $wpdb->posts p left join $wpdb->term_relationships tr on p.ID = tr.object_id where ". join(" and ", $wheres) . " order by $order_by LIMIT $limit";

   $queryresult = $wpdb->get_results($sql);

	// *************************************************
	// Return the related posts
	// *************************************************
	$result = '';
	if (is_array($queryresult) && count($queryresult) > 0)
	{
		foreach($queryresult as $tag_loop)
		{
			$result .= $before . '<a href="' . get_permalink($tag_loop->ID) . '" title="' . $tag_loop->post_title . '" id="post-' . $tag_loop->ID . '">' . $tag_loop->post_title . '</a>' . $after . "\n";
		}
		$result = "\n" . '<!-- Related Posts, generated by \'Category Tagging Plugin\' - http://www.sw-guide.de/ -->' . "\n" . $result; // Please do not remove this line.
		return $result;
	}
	else
	{
		return $notfound;
	}
}