[Admin]

I like it, and I'm gonna install it (sometime ), but I have something to say.

Why do you need a whole new file just for getting X's posts?

Right now you have this, right?

$getpostids=$DB_site->query("
	SELECT post.postid FROM post
	WHERE post.threadid='$threadid' AND post.visible=1
	ORDER BY dateline $postorder LIMIT ".($limitlower-1).",$perpage
");

(in showthread.php)
You can just change it to something like:

$getpostids=$DB_site->query("
	SELECT post.postid FROM post
	WHERE post.threadid='$threadid' ".iif(isset($postuserid), "AND post.userid='$postuserid'", "")." AND post.visible=1
	ORDER BY dateline $postorder LIMIT ".($limitlower-1).",$perpage
");

And that's it!
(unless I'm missing something you had special in showposts.php)

Just constructive criticism.