[Logician]

Easiest way:

Create a new user profile field editable by user and ask your users to enter "1" if they want normal order and "0" if they want reverse. (If you want you can hack register.php and member.php to show this profile field as a "radio button" or "check box")

Then edit showthread.php, find:

PHP Code:

$posts=$DB_site->query(" 


Before that add:

PHP Code:

if ($bbuserinfo[fieldX]==0) {$postorder='DESC';}
else {$postorder='ASC';} 


Replace X with the id of your profile field

That's it..