-- Launch "System Preferences", open the "Displays" options and change to the "Display" tab
tell application "System Preferences"
	activate
	set the current pane to pane id "com.apple.preference.displays"
	reveal anchor "displaysDisplayTab" of pane id "com.apple.preference.displays"
end tell

local index1, index2, index3, indexToUse

set index1 to 3
set index2 to 4
set index3 to 5

-- Now lets make the necessary changes
tell application "System Events"
	delay 0.2
	tell window "Built-in Retina Display" of application process "System Preferences" of application "System Events"
		delay 0.2
		tell radio group 1 of tab group 1
			click radio button "Scaled"
		end tell
		delay 0.2
		tell radio group 1 of group 1 of tab group 1
			if (value of radio button index1) is true then
				set indexToUse to index2
			else if (value of radio button index2) is true then
				set indexToUse to index3
			else if (value of radio button index3) is true then
				set indexToUse to index1
			else
				set indexToUse to index1
			end if
			click radio button indexToUse
		end tell
		--get entire contents
	end tell
end tell

tell application "System Preferences"
	quit
end tell