[Xenon]

hmm, you can try this:
open showthread.php
find:

PHP Code:

$threadid = intval($threadid);
$thread = verifyid("thread",$threadid,1,1);

if ($wordwrap!=0) {
  $thread['title']=dowordwrap($thread['title']);
}

if (!$thread['visible']) {
  $idname="thread";
  eval("standarderror(\"".gettemplate("error_invalidid")."\");");
  exit;
}

if ($thread['open'] == 10) {
   // send them to their correct thread    
    header("Location: showthread.php?s=$session[sessionhash]&threadid=$thread[pollid]");
    exit;
}
$forum=getforuminfo($thread['forumid']); 


below add:

PHP Code:

$orgthread=$DB_site->query_first("SELECT forumid FROM thread WHERE pollid=$threadid AND open=10");
$orgforum=getforuminfo($orgthread['forumid']); 


Now you can use $orgforum[title] in your Showthread template to show the original forum the thread was in.