Adding multiple background images?
 

Hi all -
I am trying to figure out how I can add some additional <div>s to my site. I want to have the page a background color, but have two background images - one that floats at the top of the page, and one that sits on the bottom of the page so that it looks like corn is growing from the bottom of the page, and the top is a sky with clouds (both behind the content box). I understand how to write the css to make them look the way I would like, but I don't know how to tell wordpress that I've added two new divs.
Any help would be greatly appreciated :)
Thanks