QuickLinks -- Click here to rapidly navigate through this document


EXHIBIT 31.1

Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes Oxley Act of 2002

I, Eric M. DeMarco, certify that:

Date: March 31, 2005

    /s/  ERIC M. DE MARCO      
Eric M. Demarco
Chief Executive Officer



QuickLinks