Updates, IE problem

Today I did a lot of updates on my site (added some stuff, mostly new html but no new shoe content). I’ve noticed that my website isn’t properly displayed under Internet Explorer browser (tested using IE 6.0). It works fine with Mozilla Firefox and Opera but there is a problem with the side menu bar when You’re using IE. If You have some other problems with my site please contact me and tell me about it. Use the contact form or post Your suggestion in the comment box . Please tell me if it works fine with the IE 7.0 ? (if You have a possibility to check it out). Thanks in advance.