Yup, that did the trick. Now it functions on IE, too. Thanks.
The styling, however, looks nothing like the article and I don't see anything to make them look like buttons. The explicit 200px style is causing the first title to break to a second line on my machines.
It really is a good idea to have someone else try out your examples before you submit an article. So many mistakes in your first example can destroy your credibility and make people disinclined to read on.