Fix my site in Internet Explorer - repost

Our website works across all browsers, until you look at old versions of Internet Explorer. It seems to work fine in the latest version of IE, but when I switch on compatability mode, a whole bunch of horrible things happen :) Please take a look at the screen shot examples of our home page in IE compatability view and Chrome. The website address is [login to view URL] so you can check it out for yourself. It needs to work across all browsers and back to IE6 if possible, or as best as it can.