Seen two other answers on other sites - may work for you. Does it not give details in the handbook ?
1. Insert a key and turn it to position 2 (dashboard lights come on BUT do not start car!!!) four times in 6 seconds
2. Switch off the ignition - a tone should sound to indicate it is now possible to program keys
3. Press any button on key - a tone should sound as confirmation
4. Repeat step 3 for ALL keys
5. Switch ignition to position 2 OR wait for 10 seconds to elapse after last key programming
http://forums.ic-games.co.uk/showthread.php?t= 13431