Action folder that notify new file inside with Growl

Hi!

With this code we can notify when file arrive in folder adding the code to Action Folder:


on adding folder items to this_folder after receiving added_items
	try
		set notification to ""
		set filelist to ("") as Unicode text
		set notifyTitle to ("") as Unicode text
		
		tell application "Finder"
			--get the name of the folder
			set the folder_name to the name of this_folder
		end tell
		set the item_count to the number of items of the added_items
		repeat with thisFile in added_items
			tell application "Finder"
				--get the name of the folder
				set the file_name to the name of thisFile
			end tell
			if the filelist is "" then
				set the filelist to the filelist & file_name
			else
				set the filelist to the filelist & ", " & file_name
			end if
		end repeat
		if the item_count is 1 then
			set notifyTitle to "Nuevo archivo en la carpeta " & the folder_name & ""
			set notification to filelist & " ha sido añadido a la carpeta " & the folder_name & "."
		else
			set notifyTitle to "Nuevo archivo/s en la carpeta " & the folder_name & ""
			set notification to filelist & " ha sido añadido a la carpeta " & the folder_name & "."
		end if
		
		tell application "System Events"
			if (application processes whose name is "GrowlHelperApp") is not {} then
				tell application "GrowlHelperApp"
					register as application ¬
						"Folder Actions" all notifications {"Added File"} ¬
						default notifications {"Added File"} ¬
						icon of application "Finder"
					
					notify with name "Added File" title notifyTitle description notification application name "Folder Actions" icon of file this_folder with sticky
				end tell
			end if
		end tell
		
	end try
end adding folder items to

Anybody can help me? to show notifications when a file is modified and when a file is deleted??