Hi paul. see these THREE entries in FORUM TECHNICAL MESSAGE BOARD
http://www.tribalpages.com/tribe/forum?f=1&v=1&mid=81527&rid=81525
http://www.tribalpages.com/tribe/forum?f=1&v=1&mid=81531&rid=81525
http://www.tribalpages.com/tribe/forum?f=1&v=1&mid=81532&rid=81525
These may help
Regards
Les