_level and function problem

I am trying to mute a mp3 player from my _level0 to the player that is on _level8 but it can’t find the Var that i set in the player?

here is what I have on my _level0 btn:

tv.onPress = function() : Void {
loadMovieNum(“video.swf”, 4);
video.alphaTo(0,0.5,“easeOutQuad”);

}

I need to add this to “tv.onPress” :
function disablePlay() {
playMusic.enabled = false;
playMusic._alpha = 50;
playMusic.gotoAndStop(1);
pauseMusic.enabled = true;
pauseMusic._alpha = 100;
mySound.onID3();
trackInfo._alpha = 100;
}

but it can’t find the “disablePlay()” in _level8

thanks guys!!