Wierd problem with Nice Looking Tabbed Menu

Hi,

I successfully configured struts-menu 2.3. and using "Nice Looking Tabbed 
Menu" . It works fine in Mozilla Firefox, but the 2nd level menus are not 
displayed properly in Internet Explorer.

I am using the following snippet in the JSP:
<div id="header">
<menu:useMenuDisplayer name="Velocity" config="templates/nicetabs.html"
bundle="org.apache.struts.action.MESSAGE">
<ul id="menuList">
<menu:displayMenu name="TabbedHome"/>
<menu:displayMenu name="TabbedAbout"/>
<menu:displayMenu name="TabbedContact"/>
<menu:displayMenu name="TabbedExit"/>
</ul>
</menu:useMenuDisplayer>
</div> 


In essence, i am sure i have configured stylessheets, images/ etc correctly 
(as it is working fine in Firefox). With the same setting the 2nd level menu 
is not showing up correctly (it just shows up as a vertical list) in 
Internet Explorer.

Any idea on how to troubleshoot this .

Thanks.
Sudhi