>Does anyone know how to access the HTML BODY from the code behind? I want to change the CSS class of the BODY in my page load event.

Yes it is possible to do from the server. I have not done it so I don't have sample code ready made but you can do it through JavaScript, or by using DIV sections or you can look at http://www.csszengarden.com/ and see how they change whole pages by just changing the style and keeping the content.