Exhibit 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our reports included in this Form 10-K, into the Company's previously filed Registration Statements on Form S-3, File No. 333-53152 and Form S-8, File No. 333-69512. /s/ ARTHUR ANDERSEN LLP San Francisco, California March 28, 2002