Ok I know this should be a simple config change but for the life of me I cannot figure it out!

If for instance we get a referral from a forum, it looks like this:
http://forums.theplanet.com/viewtopic.php
instead of how we want it to look, which is this:
http://forums.theplanet.com/viewtopic.php?t=17616

I want to be able to continue discarding session IDs though. Anyone had any luck with this?