stop();

a_btn.addEventListener(MouseEvent.ROLL_OVER, rolloverTo2);
function rolloverTo2(event:MouseEvent):void
{
gotoAndStop(2);
}

a_btn.addEventListener(MouseEvent.ROLL_OUT, rolloutTo3);
function rolloutTo3(event:MouseEvent):void
{
gotoAndStop(3);
}

a_btn.addEventListener(MouseEvent.CLICK, clickTo4);
function clickTo4(event:MouseEvent):void
{
gotoAndStop(4);
}