run script when audio CD is inserted

I wrote a quick little Growl script that tells you what Audio CD you just inserted. Just wondering how to get it to run whenever a CD is inserted.
Heres the script so far:

set appName to "CD Alert"
set notificationName to "CD Check"
set notifs to {notificationName}


tell application "Finder"
	set theDisk to (the name of every disk that format is audio format) as string
	
	tell application "GrowlHelperApp"
		register as application appName all notifications notifs default notifications notifs icon of application "iTunes"
	end tell
	if exists disk theDisk then
		tell application "GrowlHelperApp"
			notify with name notificationName application name appName title theDisk description "has been inserted"
		end tell
	end if
end tell

Hi,

Open System Preferences > Hardware > CDs & DVDs. For the ‘When you insert a music CD’ option, choose ‘Run Script…’ and locate your script.

Best wishes

John M