content: tell application "System Preferences"
      reveal anchor "Seeing_Display" of pane id "com.apple.preference.universalaccess"
  end tell
  
  tell application "System Events" to tell process "System Preferences"
      repeat while not (exists of checkbox "Use grayscale" of group 1 of window "Accessibility")
          delay 0.1
      end repeat
      set theCheckbox to checkbox "Use grayscale" of group 1 of window "Accessibility"
      tell theCheckbox
          # If the checkbox is not checked, check it to turn grayscale on
          if not (its value as boolean) then
              set checked to true
              click theCheckbox
          else # else turn grayscale off
              set checked to false
              click theCheckbox
          end if
      end tell
  end tell
  
  tell application "System Preferences"
      quit
  end tell