1 EXHIBIT A JOINT FILING UNDERTAKING The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to the Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated...

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                                    EXHIBIT A

                            JOINT FILING UNDERTAKING

               The undersigned, being duly authorized thereunto, hereby execute
this agreement as an exhibit to the Schedule 13D to evidence the agreement of
the below-named parties, in accordance with the rules promulgated pursuant to
the Securities Exchange Act of 1934, to file this Schedule jointly on behalf of
each such party.

Dated:  February 14, 2000.

XXX FAMILY 1985 TRUST                        XXXX XXX


By: /s/ XXXX XXX                             /s/ XXXX XXX
   -------------------------------           -------------------------------
        XXXX XXX, Trustee


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