Need help with a PHP redirect code

[byteventures]

I have been trying to figure out how to develop a script to redirect people from a MySpace train, which looks something like this:

The MySpace visitor will click the "add friend" button, and they will be sent to my website's redirect page, and then sent to the MySpace "collect friend" page.

A website has already created this redirect script, which can be found here:
http://www.msbuddy.com/addfriend.php

Does anyone know how it is possible to collect the friend ID in the code and redirect it to the collect friend page after the visitor has been sent to my site?

Any help is greatly appreciated. Thanks in advance for your replies!