233676 HTTP Referer Spoof Script

I need a script that will spoof the HTTP referrer information when going to another web page. Here is the scenario I want: The user accesses site A. When they click on a link to Site B, I want Site be to see the referrer as Site C. I must be able to change Site C on the fly. I will need help installing the script on the server. Must have a user-friendly interface.