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 Registration Statements File Nos. 33-84738, 33-90700, 33-97898, 333-2832, 333- 17527, 333-74274, 333-24747 and 333-26789. Philadelphia, Pa ARTHUR ANDERSEN LLP March 26, 1998