EXHIBIT 99.1
JOINT FILING UNDERTAKING
The undersigned, being duly authorized thereunto, hereby execute this
agreement as an exhibit to this Schedule 13D to evidence the agreement of the
below-named parties, in accordance with the rules promulgated pursuant to the
Securities Exchange Act of 1934, to file this Schedule 13D jointly on behalf of
each such party.
The execution and filing of this agreement shall not be construed as an
admission that the below-named parties are a group, or have agreed to act as a
group.
Dated: July 28, 2005 BERKSHIRE FUND IV, LIMITED PARTNERSHIP
By: Fourth Berkshire Associates LLC,
its General Partner
By: /s/Xxxxxxx X. Xxxxx
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Name: Xxxxxxx X. Xxxxx
Title: Managing Member
BERKSHIRE FUND V, LIMITED PARTNERSHIP
By: Fifth Berkshire Associates LLC,
its General Partner
By: /s/Xxxxxxx X. Xxxxx
-----------------------------------
Name: Xxxxxxx X. Xxxxx
Title: Managing Member
BERKSHIRE INVESTORS LLC
By: /s/Xxxxxxx X. Xxxxx
-----------------------------------
Name: Xxxxxxx X. Xxxxx
Title: Managing Director
