Thanks LK, whilst that certainly stops the warning being posted in my error_log, I still can't get my text up in the popup box.
It still pops-up, but no text whatsoever appears!
I've rehacked everything now 3 times, check each file permission for the files changed (and the one added), cleared the cache, and I'm using multihack which reports a success for each step.
Still no joy.
Ah well.
(URL and user/pass comming soon when I set you up! ;-)
Thanks!