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.

Dated: September 20, 2007

Value Fund Advisors, LLC
By:	/s/ Charles M. Gillman
	Charles M. Gillman, Manager

Boston Avenue Capital, LLC
By:	/s/ Charles M. Gillman
	Charles M. Gillman, Manager

Yorktown Avenue Capital, LLC
By:	/s/ Charles M. Gillman
	Charles M. Gillman, Manager

/s/ Charles M. Gillman  

Charles M. Gillman