Got to nextFrame when video finishes

I have looked through the forums but can not find an answer to what I am sure is a simple question.

I have a video clip, saved as a .swf

I call the swf in a MovieClip with
[AS]loadMovie(“door.swf”,this);[/AS]
This MovieClip is on frame 3 of the timeline and I do not want to progress to frame 4 until the video finishes (about 5 seconds).

I can not seem to work out how to do this.

Please give me some pointers as to where I may find the answer.

Thanks