JQUERY TAB does not work on IE 6.0

Hi,
I am having problems with tabs. They do not appear on IE 6.0, on
Firefox it works without any problems.
All my elements are named correclty, i have absolutly no clue why it
doesn't work.
See @ http://wp1132366.wp154.webpack.hosteurope.de/gambio/category-/Excell-2007.html
Thanks for your help
Greets Peili