Problem with site in IE6

[bazzablue]

I have just been informed by a client that there is a problem with a site I designed when viewing in IE6. Can't check it out for myself at the moment and they want it fixed yesterday.

The page content is sitting below the left nav menu rather than to the right of it. Site can be viewed here: http://www.edheconference.org

Is anyone with IE6 able to confirm this and what I need to do to correct it.

Thanks in advance.