Adding images to Address Book people.

Hi: I'm having trouble adding images to address book people. Can
anyone advise on the correct way to do it? Here is what I have so far:

set this_file to "/tmp/foo.tiff"

try
	tell application "Image Events"
		-- start the Image Events application
		launch
		-- open the image file

		set this_image to open this_file
		tell application "Address Book"
			set g to group "TELUS"
			--set p to person 1 of g
			set the image of p to this_image
		end tell
		--close this_image
	end tell
on error error_message
	display dialog error_message
end try