// called when screen tapped on in title screen
public void tapToBegin()
{
StartCoroutine(title.moveTo(Camera.main.ViewportToScreenPoint(new Vector3(0.25f, 0.5f, 0)), menuTransitionDuration));
StartCoroutine(mainMenu.moveTo(Camera.main.ViewportToScreenPoint(new Vector3(0.5f, 0.5f, 0)), menuTransitionDuration));
tapToBeginText.fadeTo(0, menuTransitionDuration);
tapToBeginText.setRaycastTarget(false);
}