Remote keyless entry 2000 cougar

Have just purchased a 2000 Cougar. It did not have the keyless remotes with it. I've found several places that I can purchase them but need to be sure they will work. I've read the programming guide which says to turn ignition off to acc 8 times in 10 seconds or 5 times in 10 seconds to see if it activates the door locks. I've done both and nothing happens. Does anyone have any other ideas or is there something I'm doing wrong?

http://cougardb.com/howtoshow.php?howtoid=13

try that.

These instructions will work on Mercury Cougar models, 98 +:

Cycle the ignition from OFF to RUN 4 times within 6 seconds. Turn the ignition to OFF. The LED in teh clock/trip computer will light up continuously to confirm programming mode. Press any button on 1st transmitter. The LED in the clcok will flash 4 times to confirm programming. Press any button on 2nd transmitter (up to 4 transmitters total possible). Turn ignition to OFF. The LED will turn off to indicate end of programming mode.

You will need FCC CWTWB1U322.

I have these remotes available in my Ebay store.