Prosper 202 For Affiliate Tracking

Hey Guys looking for some advice using Prosper 202

here is what i am trying to do

Lets say i want to send traffic from source A B C D E F G to a squeeze page

The customer opts in and is taken to MY own landing page that i host

What i am trying to do is be able to track how many opt ins from each different traffic source hit the landing page. so i can figure out which traffic source is converting best.

when i set up my link to drive to the squeeze page was lets say for example it was

http:/prosper202/tracking202/redirect/dl.php?t202id=531&t202kw={trafficsourceA}

I know i would have to put a post back pixel on the landing page. im struggling to know how to set this up so that the keyword from the traffic source is passed through the squeeze page to landing page so i can see how many optins i got from that 1 traffic source

I know i could test each traffic source individually and monitor my autoreponder and know how many opted in.. but i want to send a few different traffic sources at the squeeze page to test what sources are converting better .. rather than take days to test each source individually

Hope that makes sense, any help on how to set it up the tracking pixel / post would be appreciated