Can I make movie's act like buttons?

programming flash
1

I am using the following code to make movie objects fade in an grow as the mouse gets closer to them, but I want them to act as buttons when you are over them. is this possible without changing them into buttons? or can you apply this type of effect to a button (I tried doing it to the object for each stage of the button but it doesn’t seem to work)

also I would prefer to have the object grow less gradually (I would prefer it to happen when the mouse is closer than it is)
thanks for any help

onClipEvent (enterFrame) {

xdist = Math.round(_root._xmouse - this._x);
ydist = Math.round(_root._ymouse - this._y);
distancefromthis = Math.round(Math.sqrt((xdistxdist) + (ydistydist)));
this._alpha = (200-distancefromthis)+ 20;
if ((200-distancefromthis)+20 > 100) {
this._xscale = (200-distancefromthis)+20;
this._yscale = (200-distancefromthis)+20;
} else {
this._xscale =100;
this._yscale = 100;
}
}