Tab switching issue in IE and FF

Hello, I wonder whether anyone could possibly give me a clue here. There’s some tab switching content on this page

That works in Safari, Chrome and IE up to version 8 I believe, but NOT in Firefox and IE 9. It’s a mystery to me as it used to work nicely in all browsers.

I would be grateful for any ideas.

There is this script that does it, and it used Mootools

Many thanks!

In that code there’s an author’s contact address.


Bit late to the party here, but I just tried the site you link to in FireFox and IE 9/10 and it seems to work just fine.
I’m guessing you got your issue solved, right?