[KUZEN]

Легко

import mx.transitions.*;
import mx.transitions.easing.*;
MovieClip.prototype.fade = function(_in, _out, _property, _speed) {
	var tween = new Tween(this, _property, Regular.easeIn, _in, _out, _speed, true);
};
//
my_mc.fade(100, 0, "_alpha", 3);