Trigger function when loaded swf finishes

Question

I'm making a site that loads external swfs based on which
button is clicked. When the swf loads it plays an intro and then
stops at a certain point. My goal is that when you click another
button the current swf plays an outro before the next one loads.
The problem I'm having is making the outgoing movie trigger the
function that loads the next.
At first I tried just adding loadNextMovie(); to the last
frame of the loaded swf. But for some reason this causes the two
stops in the file from working so the thing just keeps looping. I
have no idea why adding this function call would prevent stop();
from working.
Is there another way to have the end of movie trigger the
function? Also, why doesn't adding loadNextMovie(); to the last
frame of the loaded swf work?

Answer 1

Ok, sure. I have main.swf that loads external.swf. Main.swf
has a function that loads a different movie. Like this:
function loadMovie():void {
trace("movie loaded")
This function is to be called from external.swf by putting
this in the last frame:
stop();
loadMovie();
But when I actually put loadMovie(); into external.swf the
stop no longer works and it just loops. What am I doing wrong? Is
trying to put this function call in the external swf the correct
approach?