Affiliate Marketing Secrets

Hello, I click on a link in google, and it says loading with this in the address bar about 20% of the time http://click.sureonlinefind.com/ads-clicktrack/click/jump1.do?sid=2CCCB2AD8A50D323F2B9392E012B82E8B3E8A882C72ABA864CFA34EDFA26A42B&affiliate=46938&subid=131212&rc=0&terms=witcher%202%20insane%20mode%20combat&stm=2013-06-14-22-42-59
Please help me resolve this irritating redirect virus

I have a website and plan on adding affiliate links for products I promote but do not sell myself. The idea is to let users choose either a charity to donate the money to or have it deposited to their paypal. However I need help coding a redirect page that will pass the user id, date, time etc and allow me to see if they actually made a purchase that will credit to me through the affiliate accounts.
The part I’m getting stuck on is how to verify they bought the item when 2 people make a purchase at roughly the same time. framed browsing? If you know the code post it, if not just give me a decent explanation of the method and I can figure it out. I’m no master of html but I’m decent.
Also of course if you know a better way than a redirect page I’d love to hear it.