Column Panels display at bottom of page after blog posts

I am using the Neoclassical Theme with WordPress 2.7.1. The Theme has three columns. The left column (panel) contains archives and cloud of tags plus a couple of other odds and ends.

The middle column contains the blog posts.

The right column (panel) contains the blogrolls.

For some reason the left and right columns no longer appear adjacent to the middle column, but, instead now show at the very bottom of the page.

The blog I refer to is Nye-Gateway to Nevada’s Rurals.

Can anyone tell me what is haywire and how to fix it?

Thanks