[Snut]

Вообщем!
Это в первый кадр:

MovieClip.prototype.alphamin = function (alpha, speed)
{
	this.alpha = alpha;
	this.speed = speed;
	this.onEnterFrame = function ()
	{
		this._alpha += (this.alpha - this._alpha) / this.speed;
		if (this._alpha < alpha)
		{
			delete this.onEnterFrame;
		}
	};
};
MovieClip.prototype.alphamax = function (alpha, speed)
{
	this.alpha = alpha;
	this.speed = speed;
	this.onEnterFrame = function ()
	{
		this._alpha += (this.alpha + this._alpha) / this.speed;
		if (this._alpha > 100)
		{
			delete this.onEnterFrame;
		}
	};
};

а это на мувик:

on (rollOver) {
	alphamin (25, 5);
}
on (rollOut) {
	alphamax (100, 10);
}