Exhibit A

JOINT FILING UNDERTAKING

The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this 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.

Signature Block
YORKTOWN AVENUE CAPITAL, LLC
/s/ Charles M. Gillman
By:	Charles M. Gillman, Manager
VALUE FUND ADVISORS, LLC
/s/ Charles M. Gillman
By:	Charles M. Gillman, Manager
/s/ Charles M. Gillman
Charles M. Gillman