unload them as soon as they are finished. most computer can
only draw so much at a time so you really don't want anything going
on while the video is drawing on the screen. once it's done, unload
it, then start back up with what you need to change. make sure you
close the ns connection.
But how can I know that the video has finished playing. Is
there an event for that (in AS2, video loaded with
MovieClipLoader)? I know there's an event when the video has
finished loading, but not when finished playing.