Do what was said above, and position your background at the bottom of the page.
Code:
background: url(images/bg.gif) #c8c8ca bottom center repeat-x;
color: #000000;
margin: 0 0 ###px 0;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 11px;
line-height: 1.5em;