Simple button using eventListener and a MovieClip class

import flash.display.Stage;
import flash.display.DisplayObject;
import flash.display.MovieClip;
import flash.events.MouseEvent;

var btn1:MovieClip = new newbutton();
var rotationz:Number = 0.5;

btn1.x = 300;
btn1.y = 250;



stage.addChild(btn1);

btn1.addEventListener(MouseEvent.MOUSE_DOWN, rotationness);
btn1.addEventListener(MouseEvent.MOUSE_UP, rotationness);

function rotationness(e:MouseEvent) {



    btn1.alpha = rotationz;
    rotationz += 0.1;
    if (rotationz >= 1) {
        rotationz = 1;
    }
    else if (rotationz < 0) {
        rotationz = 0;
    }
}


//btn1.addEventListener(MouseEvent.click);