Here is a link to the validater with your page that has 36 errors. The doctype seems to be all wrong. Use this one:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
The <html> tag does not need an ID.
Your divs and the content are separated causing many problems. You should not use tables for lay out. Read this http://upwithabang.com/articles/css-...of-tables.html
I'd recode the page from the ground up.