I don't understand where you want that background image to go... But depending on the doctype you are using, stretching an image may be impossible.... for inserting the image into the page body. In the [style] part up the top...
body {
height:100%;
padding:0;
margin:0 0 0 150px;
color:#a0a0a0
text-align:left;
font-size:9pt;
font-family:Tahoma,Arial,"MS Sans Serif",sans-serif;
background:url('
http://img231.imageshack.us/img231/9342/bluebackzi5.jpg') fixed bottom right no-repeat #101010;
}
That template is terribly written
it is also showing its age, but each to their own I guess.
This website might help you.
http://www.w3schools.com/