confirm-shutdown.scpt

on quit
  display dialog "Really shut down?" buttons {"No", "Yes"} default button "No"
    if the button returned of the result is "Yes" then
	    display dialog "Are you sure?" default answer "No"
        if text returned of the result is "Yes" then
    	    display dialog "Are you really sure?" default answer "Really no"
    	    if text returned of the result is "Really yes" then
    		    continue quit
    		end if
    	end if
    else
    	display dialog "Cancelled shutdown :D"
    end if
end quit