EXHIBIT A
(ADDITIONAL SIGNATURE PAGE TO JOINT FILING AGREEMENT)
AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G
THE UNDERSIGNED HEREBY AGREE AS FOLLOWS:
(1) EACH OF THEM IS INDIVIDUALLY ELIGIBLE TO USE THE SCHEDULE 13G TO
WHICH THIS EXHIBIT IS ATTACHED, AND SUCH SCHEDULE 13G IS FILED ON BEHALF OF
EACH OF THEM; AND
(2) EACH OF THEM IS RESPONSIBLE FOR THE TIMELY FILING OF SUCH SCHEDULE
13G AND ANY AMENDMENTS THERETO, AND FOR THE COMPLETENESS AND ACCURACY OF THE
INFORMATION CONCERNING SUCH PERSON CONTAINED HEREIN; BUT NONE OF THEM IS
RESPONSIBLE FOR THE COMPLETENESS OR ACCURACY OF THE INFORMATION CONCERNING
THE OTHER PERSONS MAKING THE FILING, UNLESS SUCH PERSON KNOWS OR HAS REASON
TO BELIEVE THAT SUCH INFORMATION IS INACCURATE.
DATE: MARCH 8, 2007
VECTOR LATER-STAGE EQUITY FUND, L.P.
BY: VECTOR FUND MANAGEMENT, L.P.
ITS: GENERAL PARTNER
BY: VECTOR ASSET MANAGEMENT, INC.
ITS: MANAGING MEMBER
BY: /s/ XXXXXX X. XXXX
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CHIEF FINANCIAL OFFICER
VECTOR FUND MANAGEMENT, L.P.
BY: VECTOR ASSET MANAGEMENT, INC.
ITS: MANAGING MEMBER
BY: /s/ XXXXXX X. XXXX
------------------------------
CHIEF FINANCIAL OFFICER
VECTOR LATER-STAGE EQUITY FUND II, L.P.
BY: VECTOR FUND MANAGEMENT II, L.L.C.
ITS: GENERAL PARTNER
BY: VECTOR ASSET MANAGEMENT, INC.
ITS: MANAGING MEMBER
BY: /s/ XXXXXX X. XXXX
-----------------------------
CHIEF FINANCIAL OFFICER
VECTOR LATER-STAGE EQUITY FUND II (QP), L.P.
BY: VECTOR FUND MANAGEMENT II, L.L.C.
ITS: GENERAL PARTNER
BY: VECTOR ASSET MANAGEMENT, INC.
ITS: MANAGING MEMBER
BY: /s/ XXXXXX X. XXXX
------------------------------
CHIEF FINANCIAL OFFICER
VECTOR FUND MANAGEMENT II, L.L.C.
BY: VECTOR ASSET MANAGEMENT, INC.
ITS: MANAGING MEMBER
BY: /s/ XXXXXX X. XXXX
------------------------------
CHIEF FINANCIAL OFFICER
PALIVACINNI PARTNERS, L.L.C.
BY: /s/ XXXXXXX X. XXXX
-----------------------------
XXXXXXX X. XXXX, MANAGING MEMBER
/s/ D. XXXXXXXX XXXXXXXXX
---------------------------------
D. XXXXXXXX XXXXXXXXX
XXXXXXX X. XXXXXXXXX TTEE
FBO XXXXXXXXX 1998 DYNASTIC TRUST
BY: /s/ D. XXXXXXXX XXXXXXXXX
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D. XXXXXXXX XXXXXXXXX, FINANCIAL ADVISOR
/s/ XXXXX X. XXXXX
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XXXXX X. XXXXX
/s/ XXXXXX X. XXXX
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XXXXXX X. XXXX
