How to get the last message in an active thread

I'm running a version of active threads and instead of previewing the first post in the thread, I want to display the most recent (last) post in the thread.

Here is the code I'm using to get the post preview page:

<?
require("/root/path/to/config.php");

	$num_active = 10;
	$num_chars  = 1000;

	$db=mysql_connect($servername,$dbusername,$dbpassword);
	mysql_select_db($dbname);

	$querylatest="select * from thread where forumid='1' or forumid='2' or forumid='3' or forumid='4' or forumid='5' or forumid='6' or forumid='7' or forumid='8' or forumid='9' or forumid='10' or forumid='11' or forumid='12' or forumid='13' or forumid='14' or forumid='15' or forumid='16' or forumid='17' or forumid='18' or forumid='19' or forumid='20' or forumid='21' or forumid='22' or forumid='24' or forumid='25' or forumid='26' or forumid='27' or forumid='28' or forumid='29' or forumid='30' or forumid='31' or forumid='32' or forumid='33' or forumid='34' or forumid='35' or forumid='36' or forumid='37' or forumid='38' or forumid='39' or forumid='40' or forumid='41' or forumid='42' or forumid='43' or forumid='44' or forumid='44' or forumid='46' or forumid='47' or forumid='48' or forumid='49' or forumid='50' or forumid='51' or forumid='52' or forumid='53' or forumid='54' or forumid='55' or forumid='56' or forumid='57' or forumid='58' or forumid='59' or forumid='60' or forumid='61' or forumid='62' order by lastpost desc limit $num_active";

	$resultlatest = mysql_query($querylatest,$db);

	while ($latest_array = mysql_fetch_array($resultlatest)) {
	
	// Get Forum Infomation
	$query_forum = "select * from forum where forumid='$latest_array[forumid]'";
	$result_forum = mysql_query($query_forum,$db);
	$forum_info_array = mysql_fetch_array($result_forum);
	
	printf("<a name=\"%s\"><HR><b>Forum</b>: %s<BR><b>Topic</b>: %s<BR>",$latest_array["threadid"],$forum_info_array["title"],$latest_array["title"]);

	$querythread="select * from post where threadid='$latest_array[threadid]' order by dateline asc limit 1";

	$result_thread_text= mysql_query($querythread,$db);

	$result_thread_array = mysql_fetch_array($result_thread_text);
	printf ("<b>Author</b>: %s<BR><b>Preview</b>:<BR>%s",$latest_array["lastposter"],substr(strip_tags($result_thread_array["pagetext"]),0,$num_chars));
	}

?>

I've tried a few things to fetch the last post in the thread but none seem to work. Any ideas?

TIA.

You need to read through the global.php file and any included files. In these files you will find helpful things such as a class designed to handle all MySQL queries and connections. Then look at the showthread.php and see how it displays the latest thread.