I think it'd be worth a look throught this faq, I think it's in there.
http://www.myturbodiesel.com/1000q/a4/vw-smart-key-remote-replacement.htm
welcometomyturbodies
http://www.myturbodiesel.com/1000q/a4/vw-smart-key-remote-replacement.htm
welcometomyturbodies