JOINT FILING AGREEMENT
Exhibit
B
The undersigned hereby
agree that
the Statement on Schedule 13G/A, and any
further amendments thereto executed by each and any of us
shall be filed on behalf of each of us pursuant to and
in accordance with the provisions of
Rule 13d-1(k)(1) under
the Securities Exchange Act of 1934, as
amended.
This Agreement may
be executed in
separate counterparts, each of which shall be deemed an
original, but all of which shall constitute one and the same
instrument.
Dated: February
12, 2008
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By:
/s/ Xxxx X.
Xxxxx
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Xxxx
X. Xxxxx, Managing Member
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POTOMAC
CAPITAL MANAGEMENT INC.
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By: /s/ Xxxx
X.
Xxxxx
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Xxxx
X. Xxxxx, President
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XXXX
X. XXXXX
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By: /s/
Xxxx X.
Xxxxx
Xxxx
X. Xxxxx
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POTOMAC
CAPITAL PARTNERS, LP
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By: /s/
Xxxx X.
Xxxxx
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Xxxx
X. Xxxxx, Managing Member of the General
Partner
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