Seems most people with AVG haven't had a problem, like Dave and myself.
However, something I thought of as a web programmer myself is that the actual problem most likely is NOT contained in the code for Hugh's site.
Using something called .htaccess someone else with a rootsweb site could potentially write code that would affect other sites on the same server.
Now, I've never used rootsweb hosting so I do not know their T&C's and such regarding the usage of .htaccess. All I'm saying is that it can be done - indeed I use one on my own server that affects several of my domains (intentionally - to prevent hotlinking of certain images).