Hi Gordon,
That's very clear and helpful - embedding one hotpot in another and moodle 2.3 too, though of course I don't know how to create the appropriate JavaScript.
As for repositories, I've tried the "alias" system too and it hasn't worked for me either. I thought it was just me not doing something right as I'm still not very used to Moodle 2. Would an external repository would work any better?
Cheers,
Glenys