I added a navigation bar to this page in the form of a table - this was not as easy as I expected. My first attempt displayed fine in Firefox and Konqueror and the HTML and CSS validated OK. But when I tried looking at it with Internet Explorer, the whole of the main part of the page was displayed below the left hand bar (because apparently IE can't deal with a table of size 100% within a CSS element whose size is not fixed). So I had to do a bit of trial and error, but it's still not displaying quite right in IE. Here are some mini screenshots.