EXHIBIT 1

JOINT FILING AGREEMENT

The undersigned hereby agree to the joint filing of the Amendment No. 2 to the Schedule 13G to which this Agreement is attached.

Dated:  February 7, 2006
	DISCOVERY GROUP I, LLC,
	for itself and as general partner of
	DISCOVERY EQUITY
	PARTNERS, L.P.
	By	/s/ Michael R. Murphy
		Michael R. Murphy
		Managing Member
	/s/ Daniel J. Donoghue
	Daniel J. Donoghue
	/s/ Michael R. Murphy
	Michael R. Murphy