Tabbed navigation hiding problem

Tabbed navigation hiding problem

Hi,

Im relatively new to using JQuery and have come across a problem I cant quite solve. I have a tabbed navigation that hides and shows divs dependant on which li is clicked.

Everything works ok in Firefox, but in IE6 and IE7 the un-selected divs will not hide, resulting in all my content being on show instead of just the one menu choice.

Here is a live link to my page in question (works ok in firefox)
http://www.tomhorner.com/websites/starkey/productmenu.php

and the jquery used

http://www.tomhorner.com/websites/starkey/jquery_scripts/tabbed.js

Any help would be greatly appreciated.

Thanks in advance