EXHIBIT 2

JOINT FILING AGREEMENT

The undersigned hereby agree to the joint filing of the Schedule 13D to which this Agreement is attached.

Dated:  February 1, 2008

DISCOVERY GROUP I, LLC

for itself and as general partner of
DISCOVERY EQUITY PARTNERS, L.P.

By	Michael R. Murphy*
	Michael R. Murphy
	Managing Member
Daniel J. Donoghue*
Daniel J. Donoghue
Michael R. Murphy*
Michael R. Murphy
*By:	/s/ Robert M. McLennan
	Robert M. McLennan
	Attorney-in-Fact for Daniel J. Donoghue
	Attorney-in-Fact for Michael R. Murphy