2 images to use as a background

[scsa20]

Hey all, I'm trying to get 2 images to be used as the background of my site but it's not going too hot. I've tried doing what http://www.w3.org/TR/css3-background/#layering said but it's just not showing up, here's what the code looks like (coping and pasting from the source on the actual page):

<!--
/* vBulletin 3 CSS For Style 'test' (styleid: 2) */
body
{
	background: #FFFFFF;
	color: #000000;
	font: 10pt verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;
	margin: 5px 10px 10px 10px;
	padding: 0px;
	background-image: url(/images/test.gif), url(/images/test2.gif);
	background-attachment: fixed, fixed;
	background-repeat: no-repeat, no-repeat;
	background-position: left bottom, top right;
}

looking at the code above you see what I've added to the Extra CSS Attributes for the body style.

So what am I doing wrong? Any help would be much appreciate.