ahh, ok, now i get you.
curmovietime = sprite(x).movietime
sprite(x).member = othermovie
sprite(x).movietime = curmovietime
updatestage
you may want to have the new movie off the screen, sync the two then move the new one in and the old one off the screen
eg
sprite(x + 1).member = newmovie
sprite(x +1).movietime = sprite(x).movietime
sprite(x+1).loch = sprite(x).loch
sprite(x).loch = -1000
I'm keeping an eye on this post so just keep posting till its sorted out.