JOINT FILING AGREEMENT
EXHIBIT
3
JOINT
FILING AGREEMENT
The
undersigned hereby agree to the joint filing of the Amendment No. 2 to Schedule
13D to which this Agreement is attached.
Dated: July
24, 2009
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DISCOVERY
GROUP I, LLC
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for
itself and as general partner of
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DISCOVERY
EQUITY PARTNERS, L.P.
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By
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Managing
Member
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Attorney-in-Fact
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Attorney-in-Fact
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