mouse script

isPressed = false;
isPressed2 = false;

function OnEvent(event, arg)

      if (event == "MOUSE_BUTTON_PRESSED" and arg == 4) then
        if (not isPressed) then
             PressKey("lshift")
            PressKey("w")
            isPressed = true;
        else
             ReleaseKey("lshift")
            ReleaseKey("w")
            isPressed = false;
        end
      end
      if (event == "MOUSE_BUTTON_PRESSED" and arg == 5) then
        if (not isPressed2) then
            PressMouseButton(1)
            isPressed2 = true;
        else
            ReleaseMouseButton(1)
            isPressed2 = false;
        end
      end

end