A Button to Disappear a MovieClip

programming flash
1

I would appreciate any help!!

I have a button and 2 MovieClips, I am trying by clicking on a button to make one of them to be alpha=0. The result I keep getting is disappearing of all.

These 2 MovieClips are on the same frame (different layers).

The code that I have:
second_btn. addEventListener(MouseEvent.CLICK, getSecondMovie);

function getSecondMovie(e:MouseEvent):void
{
gotoAndStop(“seconMovie”);
if (getSecondMovie, “firstMovie” alpha = 0);

}

I hope I made myself clear, thanks in advance.