03 Ford Expedition

Does anybody know how to setup additional keyless remotes on a '03 Ford Expedition. Any help would be greatly appreciated!

turn the key on - cycle the power locks locked to unlock - cycle the key 8 times off to on within 10 sec. - the doors should lock and unlock by themselves - then push any button on all the remotes one at a time - the locks should cycle with each remote - then just turn the key off and the locks should cycle - they are now programmed