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                                                                      EXHIBIT 23



                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation of our
report included in this Form 10-K, into the Company's previously filed
registration statements on Form S-8 (Registration Statement File No. 33-96728,
No. 333-53505 and No. 333-82537) and the Company's previously filed registration
statement on Form S-3 (Registration Statement File No. 333-46927).


                                                     /s/ ARTHUR ANDERSEN LLP
Dallas, Texas,
June 29, 2000



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