Posted 10 years ago · Author
Replace YOURIMAGEURLHERE with the URL to your background image.

Code
<style type="text/css"> 
/* Code by Eric Dave a.k.a Sputink. Tweaked by gaf210 */
#page-background {z-index:-1; position:fixed; top:0; left:0; width:100%; height:100%;}
#imvuParentTable {position:relative; z-index:1; padding:10px;}
</style>
<div id="page-background"><img  src="YOURIMAGEURLHERE" width="100%" height="100%" alt=""></div>