'null' is null or not an object

EDIT: somehow i miraculously fixed the problem.

Hey there,

I'm building a web-site right now for an acquaintance of mine. It's made in Joomla with a modified template. It works fine in Mozilla/Safari, but there seems to be an error in IE8.

The thing I'm talking about is a tabs manager, meaning that if you click on a tab it 'slides' to another picture or something else. (It's on the right part of the screen, next to the large picture slideshow).

The site is http://www.jemaghetzeggen.nl/main3

The error message is as follows:

Code:

Message: 'null' is null or not an object
Line: 65
Char: 363
Code: 0
URI: http://jemaghetzeggen.nl/main3/media/system/js/mootools.js

I tried googling and I think it's a javascript conflict somewhere between two modules/components/plugins. I have no idea what causes it. If someone could please take a look I would be very grateful.

EDIT: It does work (sort of, the layout breaks a tiny bit) in IE compatibility mode. Don't know if that helps.

Kind regards,

Arganos0

PS: I know the site is ugly. But my friend wants it that way, I can't help it. It's not something I would have made for myself, with the screaming banners etc. The copyrighted images are just placeholders for now. Don't kill me.