EX-1 2 a06-13902_1ex1.htm EX-1

EXHIBIT 1

JOINT FILING AGREEMENT

 

The undersigned hereby agree to the joint filing of the Amendment No. 4 to the Schedule 13G to which this Agreement is attached.

 

Dated:  June 16, 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