EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this Form 10-K of our report into the Company's previously filed Registration Statement on Form S-8 File No. 333-66681. It should be noted that we have not audited any financial statements of the Company or performed any audit procedures subsequent to the date of our report. /s/ Arthur Andersen LLP Philadelphia, PA March 28, 2000