not Valid XHTML

Hi. I have problems with not Valid XHTML

http://validator.w3.org/check?uri=http%3A%2F%2Fblog.brodowski.net.pl%2F&charset=%28detect+automatically%29&doctype=Inline&ss=1&outline=1&group=0&verbose=1

# Line 530, Column 6: XML Parsing Error: Opening and ending tag mismatch: body line 93 and div .

</div>

# Error Line 549, Column 7: XML Parsing Error: Opening and ending tag mismatch: html line 2 and body .

</body>

Can somebody please tell me how to fix it?