Fade out from 1 and in from 0

1

Hi all,

I`m fading level1 out from level1 with this script:

speed = 10;
this.onEnterFrame = function () {
this._alpha>0 ? this._alpha -= speed : delete this.onEnterFrame;
};

and I`m trying to fade it (level1) back in from level0 (or main) like this:

_root.navigation2.onEnterFrame = function() {
       // if (_level1._alpha<100) {
               _level1._alpha += 10;
        //}
}

what`s the catch??? does someone know?

thanks in advance,
m.