Formatting issues in Internet Explorer

In Firefox my website looks exactly how I’d like. When one accesses my page using Internet Explorer 6.0, however, there are several formatting issues:

Comments appear in larger font
Sidebar listings appear in larger font
Empty space appears where I deleted the footer

My website is:
https://www.ekarj.com

I’m using a theme called veryplaintxt.

Any help or direction would be greatly appreciated.