import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

var first:Boolean = true;

if(first){
    first = false;
    stop();
    stage.addEventListener(KeyboardEvent.KEY_DOWN,function(e:KeyboardEvent){
        if(e.keyCode == Keyboard.RIGHT)gotoAndStop(currentFrame%totalFrames+1);
        if(e.keyCode == Keyboard.LEFT)gotoAndStop(currentFrame%totalFrames-1);
    });
}