EX-2 3 a08-16086_1ex2.htm EX-2

EXHIBIT 2

 

JOINT FILING AGREEMENT

 

The undersigned hereby agree to the joint filing of the Amendment No. 6 to Schedule 13 D to which this Agreement is attached.

 

Dated:  June 5, 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/ Mark Buckley

 

 

 

  Mark Buckley

 

 

 

  Attorney-in-Fact for Daniel J. Donoghue

 

 

 

  Attorney-in-Fact for Michael R. Murphy