public function onKeyDown(e:KeyboardEvent):void {
  keys[e.keyCode] = true;

  switch(e.keyCode)
  {
    case Keyboard.W:
      spellTimerRunning = true;
      combo = "W";
      if (spellTimerRunning)&&(allow2ndKey) {
        combo = "WW";
      }
    break;
  }
}

public function onKeyUp(e:KeyboardEvent):void {
  keys[e.keyCode] = false;
  if (spellTimerRunning) {
    allow2ndKey = true;
  }
}