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 Forms S-3 (File  Numbers  333-09917,  333-10117 and
333-47098) and Forms S-8 (File Numbers 333-09911, 333-09909 and 333-46086).


                                            /s/ ARTHUR ANDERSEN LLP


Phoenix, Arizona
January 9, 2002