Fadeing in a MC

[Cosizzle]

Hello,

Im trying to fade in a MC that is loaded. This is my script but I cant get it to work… Any ideas?

this.onEnterFrame = function() {
	//holder._alpha = 0;
	holder._alpha+3;
	if (holder._alpha>99) {
		holder._alpha = 100;
	}
}

Thank you