Thanks for your input, everyone (and to those who replied off-list). -Mark Mark A. Rath Aquatic Specialist IV Charles River/NIH-Contractor 14G/104A 14 Service Rd. South MSC 5590 Bethesda, MD 20892-5590 Cell phone: (410) 428-9851 Fax: (301) 480-1317 E-mail: rathmark from mail.nih.gov