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. 333-94629 /s/ Arthur Andersen LLP San Francisco, California March 29, 2001