Container DIV not working in Firefox, Internet Explorer and Opera

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Hi y’all! I've run into an issue with my container DIV not working in FF, IE and Opera. Oddly, all but the "About Us" page works as it should in FF and Opera, but *apparently its not being recognized at all in IE. *(I'm working from a Mac... a friend has been kindly aiding me with viewing it in IE from his laptop.) I built it in Dreamweaver, and viewing it from my desktop in FF and Opera, all pages work fine. In Safari, everything works perfectly fine (as viewed both from my desktop and having uploaded it to the server).

The test site is http://www.charlessteeleandassociate...CSA/index.html.

I'd greatly appreciate any wisdom that you can pass along!

P.S. Please forgive any sloppy coding. I'm still getting the hang of web design.

UPDATE 10/3/9:
I've found that by removing the Ajax pagination from the "Charles Steele Bio" tab has remedied the 'parent DIV' situation... however, I still really want the ajax pagination in his Bio Div. Any ideas for remedying the new problem? Thanks!

UPDATE 10/4/9:
Hi again! I've remedied the situation so far. I'd still like to know why the ajax pagination script I was using was causing the parent div to mess-up... For now, I've chosen to use hidden div's for revealing the Bio's pages.