Site breaks in less than IE8

[joediffdez]

I was looking at our site www.thebestebooksonline.com/store/index.html, in IE Tester and the right sidebar (we have a three column setup. [left side bar, main content, right side bar]) In less than IE7, IE6, and IE 5.5, it forces the right sidebar under the left sidebar, but I can't see why. Maybe something with the css such as padding/margins? I was thinking of putting in a conditional statement for less than IE8 users to update their browser, but I don't think this would be best practice. Any ideas?

[Jim]

I tried running your index.html page through the the html validator at http://validator.w3.org
and it came back with this error
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Sorry, I am unable to validate this document because on line 254 it contained one or more bytes that I cannot interpret as utf-8 (in other words, the bytes found are not valid values in the specified Character Encoding). Please check both the content of the file and the character encoding indication.

The error was: utf8 "\x92" does not map to Unicode
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So look at your page source and see if you can find that code and fix what ever is causing it. Then try running the page through the html validator again. Do the older browsers support utf-8 encoding?