Your document matches closest to HTML 4.01. So add these lines to the top of the document code:
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
Then go to
http://validator.w3.org/ and check out the errors found and make the required changes of which there should only be a few. For instance wherever there is
& in the HTML code, change it to
&. Also change the style tag from <style> to <style type="text/css">. And get rid of the
height attribute on line 56. You are done.