programming a remote

I would like to reprogram a door lock remote to use on my 97 Tracer 4dr that I have from another Escort. Any one know how to do this? I read on a site that you turn your ignition switch from off to on 4 times till the doorlock & then unlocks, then turn the switch off & press any button on the remote. The door locks should then lock, comfirming that it was programmed. I get the car to respond with the first step, but the remote doesnt program. The batterys are good in the remote because it work on the other car. Any ideas?
FRED