Improper actionscript?

I have a movie clip called mcmoviedown… its alpha is set to zero… on another mc i have this code:



**on (press) {
    play();
    if (_root.mcmoviedown._alpha == 0) {
        _root.mcmoviedown._alpha = 100;
    };
}**


This does NOT set the alpha of my movieclip to 100 for some reason

Im sorry… I’m a novice…