Go to and play & load movie

I want to put an action on a button that jumps to a new frame, loads a movie (.swf) in that frame, into an empty movie clip, all in one go.

I have used the following on the button but it doesn’t function properley.

on (release) {
gotoAndPlay(5);
_root.mtClip.loadMovie(“test.swf”, 1);
}

I have made sure that the movie instance is named correctly.

Any suggestions would be gratefully received.