颜色渐变效果

for (n=0; n<=200; n++) {
attachMovie("ball", "ball"+n, n);
this["ball"+n]._x = 100+n;
y = Math.sin(n*Math.PI/100)*50+150;
this["ball"+n]._y = y;
myclor = new Color(this["ball"+n]);
myclor.setRGB(255 << 16 | Math.floor(255*(y-100)/100) << 8 | 0);
}