I believe I used that same script before and it works. We left our dog for a few days (people were staying with her at night) and initiated video chats with her from hawaii. The macbook was put in the room and left on. We had to adjust power management so that the display would sleep but that the computer wouldn’t shut off. It worked.
Another, simpler option would be to go under ichat prefs. Switch to the ‘video invitation’ event, and then check the ‘run applescript’ box. highlight ‘auto accept’, and he’s good to go. The only issue could be if he gets alot of video invites, but at 84 I’m guessing you’re probably the only person on his buddy list :-).
In your situation, you might want to also use the same mobile me account so that you can start screen sharing via back to my mac. If his internet goes down, aol IM service is interrupted, etc., ichat will log off and cause problems.
The section about having ichat automatically come on at startup is an excellent one as well. Just be sure you teach him how to restart and that he gets that down pat. After that you should be able to overcome any difficulties you encounter.
Good luck!
John
Magic Feather Inc.