keymap = {
  [1]="f13",
  [2]="f14",
  [3]="f15",
  [4]="f16",
  [5]="f17",
  [6]="f18",
}

function OnEvent(event, gkey, family)
  mkey = GetMKeyState()
  if mkey == 3 then
    key = keymap[gkey]
    if event == "G_PRESSED" then
      PressKey(key)
    end
    if event == "G_RELEASED" then
      ReleaseKey(key)
    end
  end
end