Hello, I wonder whether anyone could possibly give me a clue here. There's some tab switching content on this page http://www.brt.org.uk/donate

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
http://www.brt.org.uk/plugins/tabcontrol/tabcontrol.js

Many thanks!