I have a Jabra EarSet (part #5060-0000-02) for the Nokia 8800 that works with the Treo including the on/off button. It has 3 black rings. I'd like to use this headset with my Motorola StarTac which needs a standard headset (2 rings). Is there an adapter for this? I understand there is an adapter to go the other way.

(Unfortunately I carry 2 phones because Cingular coverage for my Treo is awful and a number of people have my StarTac phone number.)