flash button stops working after 1 click

So i have 3 buttons and when i click neither of them ,the clicked one loads the image that i want and them all of them stops working.

import flash.events.MouseEvent;
import flash.net.URLRequest;
imgbtn1.addEventListener(MouseEvent.CLICK, OnReleaseMyButton1);
function OnReleaseMyButton1(event:MouseEvent):void
{
    infoField.visible = true;
    var imageLoader:Loader = new Loader();
    imageLoader.load(new URLRequest("picture1.png"));
    addChild(imageLoader);
    trace("BUtton1");
}
imgbtn2.addEventListener(MouseEvent.CLICK, OnReleaseMyButton2);
function OnReleaseMyButton2(event:MouseEvent):void
{
    infoField.visible = true;
    var imageLoader:Loader = new Loader();
    imageLoader.load(new URLRequest("picture2.png"));
    addChild(imageLoader);
    trace("BUtton2");
}
imgbtn3.addEventListener(MouseEvent.CLICK, OnReleaseMyButton3);
function OnReleaseMyButton3(event:MouseEvent):void
{
    infoField.visible = true;
    var imageLoader:Loader = new Loader();
    imageLoader.load(new URLRequest("picture3.png"));
    addChild(imageLoader);
    trace("BUtton3");
}
//
 /*function startLoading(whichImage)
{
    var imageLoader:Loader = new Loader();
    imageLoader.load(new URLRequest("whichImage"));
    addChild(imageLoader);
} */

Here is a link to the .swf file to see what exactly i mean.http://www.fileconvoy.com/dfl.php?id=gf45387fd831a092a999199587cb570046f7c5cf00