The entire Cambridge Blue menu shows up as an unordered list for me in Internet Explorer when I have CSS disabled. Does that not happen for you?
I notice in taking a closer look at your web page, when I disable CSS in IE, it's doing the same thing for me -- only showing the top level menu links. I'm not sure what is causing that. However, I would like for you to try a couple of things to try and narrow it down.
Change this statement on your page:
Code:
<body class="thrColHybHdr" onload="changedrcimage();initCITA()" >
to this:
Does that make any difference in the problem?
Also, try commenting out all your javascripts except the ones needed for UDM. Does that make any difference?