Sorry, above was I.guest, I believe that both Keith and teribus have shown that they have a good grasp of the subject,. They have clearly stated their views and backed their views with facts. We do have insight into your knowledge of the subject, guest...it is in all of your posts. You appear to know nothing of the subject, same league as Dave and Dave, yet you all continue to make arses of yourselves,
Why not gracefully admit to ignorance and call it a day.