Um.... there's a LOT of problems with your code. Just a few issues:
1. Your <title> tag is in the body of the site -- move it up to the <head> where it belongs.
3. Why is everything hard-coded even though you have a style sheet? (Speaking of which, your style sheet should not be randomly slapped into the middle of the <body> of your page. You should call it externally.)
4. You call the following code in the middle of your page body:
That meta tag is already included in the <head> and doesn't belong in the body.
<meta http-equiv="Content-Type" content="text/html;
<!--- include header --->
6. Then you have the 2nd table which, after further review, has another 4 or 5 tables nested inside it.
I hate to say it, but it's a mess! The copyright of 2007 is a dead giveaway this site isn't going to work right in certain browsers. It's outdated code and needs to be re-written (and I'd suggest a bit of a makeover. A site that is only 754p wide is really small on a standard monitor today.