Hi, In message <9B539B017F464B70913040A147E79DF2@RobinPC>, Robin Carrier <robin@no1bird.com> writes > >clear as mud(or should I say sand?), but thanks for trying> A picture is worth a 1000 words see: http://alpinegardensociety.net/diaries/… / -- David Pilling email: david@pilling.demon.co.uk web: http://www.davidpilling.net/ post: David Pilling, P.O. Box 22, Thornton-Cleveleys, Blackpool. FY5 1LR. UK