Returning displaystate to normal

1

I’m trying to make it so when an FLV stops playing the swf goes back to normal screen mode. I can’t figure out why its not working, I can’t really figure out what variable I should check to make it work. This is what I have so far

function windowReturn() {
if (_root.getBytesTotal() == 0) {
Stage[“displayState”] = “normal”;
_root.fullScreen_butt.gotoAndStop(1);
}
}