Alpha fade question

Hey all,

I’m trying to get a star to when clicked spins and hovers over the button on the nav bar which I have achieved so far, but I want the star to fade when it reaches its destination. I think the star spinning all the time gets a little annoying. Here is the code I’m using so far w/ the star.

MC CODE
onClipEvent (load) {
Xpos = 744;
}
onClipEvent (enterFrame) {
Xa = _root.bottone1._x;
Xdiff = Xpos-Xa;
Xmove = Xdiff/7;
_root.bottone1._x = Xa+Xmove+43;
}
onClipEvent (enterFrame) {
i = getProperty(this,_rotation);
setProperty(this,_rotation,i + 10);
}

Button code::
on (press) {
_root.bottone1.Xpos = 190;
}

So the star rotates and flys in to the button clicked, but I just want it to fade when it arrives maybe a second after or so.
Thanks for the help.
(Texas Flasher)