# File lib/as_event.rb, line 63
  def self.for_jbutton(joynum, button)
    raise "No such joystick" unless (0..(Joysticks.length)).include?(joynum)
    raise "No such button" unless (0..(Joysticks[joynum].buttons)).include?(button)
    button<<4 | (3 + joynum)
  end