ActionScript 2.0 :: Add Audio That Will Play When User Moves Over Buttons?

I have a presentation which is split into several different movies which are linked together by buttons, all I am trying to do is add a sound which will play when the user moves over the button, and then another that will play when they click on the button; I got this to work once but it cut off the sound because it loaded a new movie, so I found the onSoundComplete command, which I've tried in a load of different ways but nothing works...
here's the code i've got at the moment:

on (rollOver) {
mySound = new Sound(this);
mySound.attachSound("twisted1");
mySound.start(0, 0);
} on (release) {
mySound = new Sound(this);
mySound.attachSound("twisted2");
mySound.start(0, 0);
twisted2.onSoundComplete = function(loadMovie("history.swf", "this"));
}

And this is the error that I am getting:
**Error** Scene=home, layer=links, frame=1:Line 12: ')' or ',' expected twisted2.onSoundComplete = function(loadMovie("history.swf", "this"));
I've tried a few things but i just seem to get more errors...