EXHIBIT 23.1 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 Prospectus constituting part of the Registration Statement on Form S-4 (No. 333-55831) and in the Registration Statements on Form S-8 (Nos. 333-10429 and 333-48143). /s/ ARTHUR ANDERSEN LLP - -------------------------------------------- San Francisco, California January 23, 2001