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<PAGE>
EXHIBIT 1
JOINT FILING AGREEMENT
The undersigned hereby agree to the joint filing of the Schedule 13G to
which this Agreement is attached.
Dated: July 7, 2000
WANGER ASSET MANAGEMENT, LTD.
for itself and as general partner
of WANGER ASSET MANAGEMENT, L.P.
By: /s/ Bruce H. Lauer
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Bruce H. Lauer
Vice President
ACORN INVESTMENT TRUST
By: /s/ Bruce H. Lauer
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Bruce H. Lauer
Vice President and Treasurer
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