Form: SC 13G/A

Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutions

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Page 15 of 15 Pages

EXHIBIT A

Pursuant to Rule 13d-1(f)(1)(iii) of Regulation 13D-G of the
General Rules and Regulations of the Securities and Exchange Commission
under the Securities Exchange Act of 1934, as amended, the undersigned agree
that the statement to which this Exhibit is attached is filed on behalf of
each of them.

APERTURE ASSOCIATES, L.P.

By: Horsley Bridge Partners, Inc.
Its: General Partner


By: /S/ PHILLIP HORSLEY
Phillip Horsley
Its: President


HORSLEY BRIDGE PARTNERS, INC.


By: /S/ PHILLIP HORSLEY
Phillip Horsley
Its: President



/S/ KEVIN P. WRIGHT
KEVIN P. WRIGHT



APERTURE PARTNERS, L.P.


By: /S/ PHILLIP HORSLEY
Phillip Horsley
Its: General Partner



/S/ PHILLIP HORSLEY
PHILLIP HORSLEY



/S/ GARY L. BRIDGE
GARY L. BRIDGE



/S/ N. DAN REEVE
N. DAN REEVE