IE7 bug?

Hi,

I really love this plugin, its very nice to use. I got this website working in all new browsers (Chrome, Firefox, IE9) but IE7 and IE8 doesn’t work.

The big one works:
http://www.ewd-systems.eu/

But the small ones doesn’t, see:
http://www.ewd-systems.eu/uber-uns-2/

What am I doing wrong? I’m dying here. 🙁

http://ww.wp.xz.cn/extend/plugins/ml-slider/