Welcome to CF!
Your page is a good start. Kudos for using a DOCTYPE; but with your page layout there's really no reason not to go to XHTML:
Try that for a header. XHTML requires closing tags, all lowercase (<a> and not <A>) tags and some other constraints that will help your code be better formed and more cross-browser friendly.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Page Title Goes Here</title>
Some other things on your page to watch out for are block-level elements incorrectly inside inline elements (<div> inside <a> is a no-no):
along with use of deprecated elements like <font> and <center> (CSS styles control these effects now).
<A HREF="screenshot.html" STYLE="text-decoration: none">
<DIV ID="menubuttonlast"><FONT ID="menufont"><CENTER>SCREENSHOT</CENTER></FONT></DIV>
One more thing: You have a profusion of divs on your page. I would read about divitis and semantic code.