XHTML Validation problems

document:
http://www.aicko.net/v3/

validation page (w/ info): http://validator.w3.org/check?uri=ht...doctype=Inline

I've tried and tried, but I just can't get all those errors left fixed. I had a bit of time fixing 54 errors while converting from HTML to XHTML, but I couldn't lower them more than that.

Plus, it looks weird in IE and totally different from how it acts in FF.

I'd be very glad if you'd help me somehow.