Subsequently I have found that the code works when a registered user
logs in. I dont' think this is a bug with the google code, but rather
a conflict caused by javascript code that Joomla is adding to the
document.onload event. In my situation, javascript code is added when
anyone higher than a registered user logs in (Manager, Author,
Administrator, etc...). Now using firebug to track this down...
...btw, I can't believe how much js code is now attached to a page!