I scribbled: |>http://www.physics.ox.ac.uk/sat/tss.html |> |>to a Quicktime movie provided by Dr Kym Thalassoudis. You are welcome to |>view it of course (note it's 1.5 MB in size). My only reservation is |>that I have not yet managed to confirm whether it got to me intact( Dr. In order to save your bandwidth (apologies for following up my own message) I've now tried this on a PowerMac and it is definitely corrupted. I will let you know when a working version appears... Sorry. -- Neil Clifford <n.clifford@physics.oxford.ac.uk> http://www.physics.ox.ac.uk/sat/satintro.html