[Marco van Herwaarden]

Maybe something like (using michael's code, no coffee yet, so this is not bugfree, but you'll get the idea:

PHP Code:

<?php 

if ($_GET['p']) 
{ 
$p = intval($_GET['p']); 
$postid = $DB_site->query_first("SELECT postid FROM " . TABLE_PREFIX . "post
WHERE import_id = $p");
header("Location: http://www.yoursite.com/forum/showthread.php?" . p=$postid#$postid); 
} 
else if ($_GET['t']) 
{ 
$p = "t=" . intval($_GET['t']); 
} 

?>

And the same for threadid, but you'll figure that out.