back_state=RegRead("HKCU", "\ControlPanel\BackLight\", "Brightness")
acback_state=RegRead("HKCU", "\ControlPanel\BackLight\", "ACBrightness")
if(back_state>0)
	back_state = back_state - 2
            If(back_state=9)
                back_state=10
            endif
	SetBacklight( back_state, acback_state )
	RegWriteDWord("HKCU", "\ControlPanel\BackLight\", "Brightness", back_state)
	Sleepmessage(1,back_state)
endif
exit