Worth pro upgrade

I am frequently access mac mini from macbook air via screen sharing. My mac mini has two monitors and higher resolution than my macbook air. Thanks to apple script support in pro version, I can switch resolution and mirring toggle with a single keyboard shortcut(using Automator). Here is my script. I combined two examples from support page.

tell application "Display Menu"
set theResolution to current resolution on display "DELL U2412M"
if (theResolution = "1920 x 1200") then
toggle mirroring
delay 3
select resolution "1440x900" on display "DELL U2412M"
else
toggle mirroring
end if
end tell

authere about Display Menu