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                                                                    EXHIBIT 23.1


                         CONSENT OF ARTHUR ANDERSEN LLP


                        [ARTHUR ANDERSEN LLP LETTERHEAD]


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated March 3, 2000,
included in the Company's Form 10-K for the year ended December 31, 1999, and to
all references to our firm included in this registration statement.

/s/ ARTHUR ANDERSEN LLP

ARTHUR ANDERSEN LLP

Dallas, Texas

December 22, 2000



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