<DOCUMENT>
<TYPE>EX-99.A
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<FILENAME>doc2.txt
<DESCRIPTION>SUBSIDIARIES OF HOLDING COMPANY
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                                    EXHIBIT A


                 RELEVANT SUBSIDIARIES OF PARENT HOLDING COMPANY

PART A: TCW ENTITIES

PARENT HOLDING COMPANY:

      The TCW Group, Inc.




RELEVANT SUBSIDIARIES THAT ARE PERSONS DESCRIBED IN RULE 13d-1(b):

       (i)   Trust Company of the West, a California corporation and a bank as
             defined in Section 3(a)(6) of the Securities Exchange Act of 1934.

       (ii)  TCW Asset Management Company, a California corporation and an
             Investment Adviser registered under Section 203 of the Investment
             Advisers Act of 1940.

This Schedule 13G is being filed by the TCW Group, Inc., a Nevada corporation
("TCW"), on behalf of itself and its direct and indirect subsidiaries, which
collectively constitute The TCW Group, Inc. business unit (the "TCW Business
Unit" or the "Reporting Person").  The TCW Business Unit is primarily engaged in
the provision of investment management services.

As of July 6, 2001, the ultimate parent company of TCW is Societe Generale,
S.A., a corporation formed under the laws of France ("SG").  The principal
business of SG is acting as a holding company for a global financial services
group, which includes certain distinct specialized business units that are
independently operated, including the TCW Business Unit.

SG, for purpose of the federal securities laws, may be deemed ultimately to
control TCW and the TCW Business Unit.  SG, its executive officers and
directors, and its direct and indirect subsidiaries (including all business
units except the TCW Business Unit), may beneficially own shares of the
securities of the issuer to which this schedule relates (the "Shares") and such
shares are not reported in this statement.  In accordance with Securities and
Exchange Commission ("SEC") Release No. 34-39538 (January 12, 1998), and due to
the separate management and independent operation of its business units, SG
disclaims beneficial ownership of Shares beneficially owned by the Reporting
Person.  The Reporting Person disclaims beneficial ownership of Shares
beneficially owned by SG and any of SG's other business units.


PART B: NON TCW ENTITIES

PARENT HOLDING COMPANY:

     ROBERT A. DAY (an individual who may be deemed to control the entities
described below which are not subsidiaries of The TCW Group, Inc.)

RELEVANT SUBSIDIARIES THAT ARE PERSONS DESCRIBED IN RULE 13d-1(b):

Oakmont Corporation, a California corporation and an Investment Adviser
registered under Section 203 of the Investment Advisers Act of 1940.




                                       A-1


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