CUSIP No. 69323K100 SCHEDULE 13D

CUSIP No. 00000X000  SCHEDULE 13D 

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: August 9, 2007

	Value Fund Advisors, LLC
	By:	/s/ Xxxxxxx X. Xxxxxxx
		Xxxxxxx X. Xxxxxxx, Manager
	Boston Avenue Capital, LLC
	By:	/s/ Xxxxxxx X. Xxxxxxx
		Xxxxxxx X. Xxxxxxx, Manager
	/s/ Xxxxxxx X. Xxxxxxx
	Xxxxxxx X. Xxxxxxx