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EXHIBIT 4
JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)
The undersigned acknowledge and agree that the foregoing statement on
Schedule 13D is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13D shall be filed on behalf
of each of the undersigned without the necessity of filing additional joint
filing agreements. The undersigned acknowledge that each shall be responsible
for the timely filing of such amendments, and for the completeness and accuracy
of the information concerning it contained therein, but shall not be responsible
for the completeness and accuracy of the information concerning the others,
except to the extent it knows or has reason to believe that such information is
inaccurate. This Joint Filing Agreement may be executed in any number of
counterparts and all of such counterparts taken together shall constitute one
and the same instrument.
Dated: April 2, 2001
/s/ Xxxxxxx Xxxxxxxxxx
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By: Xxxxxxx Xxxxxxxxxx
CREST PARTNERS II, L.L.C.
By: /s/ Xxxxx X. Xxxxxxxxxxx
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Name: Xxxxx X. Xxxxxxxxxxx
Its: Managing Director
BV PARTNERS III, LLC
By: /s/ Xxxxxx Xxxxx
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Name: Xxxxxx Xxxxx
Its: Managing Member
BANCBOSTON VENTURES, INC.
By: /s/ X. Xxxxx XxXxxxxxx
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Name: X. Xxxxx XxXxxxxxx
Its: Vice President
