You'll need to edit myfunctions.ini.php about line 48:
Code:
$return = $LINK_BASE . $id . '/' . $keywords . '/';
Change to your desired format. Possibly something like:
Code:
$return = $LINK_BASE . $keywords . '_' . $id . '.html';
Also edit .htaccess line:
Code:
RewriteRule ^([0-9]+)/.*$ index.php?go=subcat&id=$1 [L,NC]
Possibly something like:
Code:
RewriteRule ^.*_([0-9]+).html$ index.php?go=subcat&id=$1 [L,NC]