Loaded Movie losing actions - path problem?

programming flash
1

I have posted a question regarding this before, but I have tried the same solution and it is not resolving my problem. I have some code in a movie that is not working when it is loading into another movie. I tried changing any instances of _root to this, but that is not working. Is it possible that it is a setInterval issue?

Here is the code (original code that is working within the loaded movie)

function loadPhrase4(){
	clearInterval(loadPhrase4);
	_root.attachMovie("phrase4","phrase",998)
	_root.phrase._x = 374.6;
	_root.phrase._y = 6.3;
	_root.phrase._alpha = 100;

MovieClip.prototype.grow = function(j,k) {
	this._xscale += k;
	this._yscale = this._xscale;
	if (this._xscale>j-1 && this._xscale<j+1) {
		delete this.onEnterFrame;
	}
};
_root.phrase.onEnterFrame = function() {
		this.grow(2000,100);//2000 is size?, 100 is speed of growth? both effect each other 
		if (this._alpha <= 100)
		{
			this._alpha -= 6;//speed of alpha fade
		}
		else{
			delete this.onEnterFrame;
		}
}
}
loadPhrase4 = setInterval(loadPhrase4, 100);