Ugh, I figured it out! When I copied your code from this page, it pasted “curly” quotes instead of “straight” quotes, so the code wasn’t being parsed properly. I corrected it and it is working now.
The only trouble is that the tabs don’t work when I link directly to one tab. So I either need to have the other tabs work properly, or have them not display at all. Any ideas about that?
Here’s the link.