sidebar being squeezed out

Hello again,
Thanks beel, podz, etc. for your help getting me going. I have one more nagging issue I’m trying to resolve.
My sidebar shows perfectly in Firefox on a couple computers I’ve checked, including mine. On those same computers it shows decently in IE though there is usually a sizable blank space between the content area and the sidebar on the right on IE. But on a couple others the sidebar gets squeezed causing it to be pushed to the very bottom of the page, starting right below where the blog content box ends. This seems to be the case in both IE and FF on those.
I’ve fiddled with it a lot to no avail. Thanks for any suggestions anyone can give that would get the sidebar to show in all situations.
http://www.bravesnewsworld.com/wp-layout.css