Custom Affiliate Tracking Programming

We are trying to create a method where we can pass affiliate ID from one URL to another.? Here is the situation.? ? Shopping Cart ? We have a shopping cart/store from ([[login to view URL]][1]) whish is located at ([login to view URL]). ? This shopping cart as has an affiliate module that allows for partner and commission tracking.? ? Our Site ? Our site is located at [[login to view URL]][2]. When a user clicks through an affiliate link we want them to land on our site rather than the online store.? ? Our Site to Shopping Cart ? Users can then click the Buy It Now button from our site and end up at the online store ([login to view URL]).? But when this happens, they will loose the unique affiliate ID. ? Sample Affiliate ID URL ? [login to view URL]? (xxxxxx is the affiliate ID)