thanks, Tom i'll do it before the end of the month just aboput to leave on a trip Best regards Neil Neil J. A. Sloane AT&T Shannon Labs, Room C233, 180 Park Avenue, Florham Park, NJ 07932-0971 Email: njas at research.att.com Office: 973 360 8415; fax: 973 360 8178 Home page: http://www.research.att.com/~njas/