Originally Posted by Zyber

1. You can create a PHP file which redirects the surfer. header("Location: http://sponsor.com/?affid=1234");
But there is no 100% sure way of hiding your affiliate id from prying eyes. Using frames can be risky for the sales tracking.

2. Why do you want to hide this information from your sponsor? Don't think I want to help you on this one.

3. It is not possible to hide your aff. id totally from someone who is determined to find out.