Not sure what list you are referring to, however there is a fault in your HTML at line 405 with the style tag on the table which you should probably clean up:
style="BACKGROUND-IMAGE: url<img src="//images/afbottomgraphic.jpg"
The second double quote is ending the style tag prematurely. Background-image should be given a url in the form of url(path-to-file)
.
EDIT: Ok, I see your expandable sections in the new URL. They work correctly in Firefox, but IE8 is generating the following error: "Object doesn't support this property or method listexpander.js, line 69 character 3".
Looking at that line of code, the first thing I can see is that the variable "li" should have a "var" declaration on it to avoid it interfering with any global vars. I would also recommend running listexpander.js through jslint (http://www.jslint.com/) since the syntax has a few oddly positioned semi-colons.