Making my query more efficient

[uber]

I have a query that looks up the last ten threads that the user has participated in. I also have it lookup the pagetext field of the last post for the title link. The problem I have is, I cannot figure out how to query the last post without running the query in another loop causing an additional ten queries to run.

$getthreads = $DB_site->query("
	SELECT DISTINCT thread.title,thread.lastposter,forum.title as forumtitle,thread.forumid,thread.views,thread.replycount,thread.threadid,thread.lastpost FROM post 
	LEFT JOIN thread ON post.threadid=thread.threadid
	LEFT JOIN forum ON thread.forumid=forum.forumid
	WHERE post.userid = '$bbuserinfo[userid]' ORDER BY thread.lastpost DESC
	LIMIT 10
");

	while($threads = $DB_site->fetch_array($getthreads))
	{

	$getlpbody = $DB_site->query("
		SELECT dateline, pagetext FROM post 
		WHERE dateline = $threads[lastpost]
	");	
	
		$lastpostbody = $DB_site->fetch_array($getlpbody);
		$threads['date'] = vbdate($vboptions['calformat2'],$threads['lastpost']);
		$threads['time'] = vbdate($vboptions['timeformat'],$threads['lastpost']);
		$trimmed_thread_title = fetch_trimmed_title($threads['title'], 32);
		$trimmed_forum_title = fetch_trimmed_title($threads['forumtitle'], 30);
		$trimmed_message_body = fetch_trimmed_title($lastpostbody['pagetext'],250);
		$row_color = ($row_count % 2) ? $color1 : $color2;
		$row_count++;
		
		eval('$usersthreads .= "' . fetch_template('mylizard_mythreads') . '";');
	}