I'm using some CSS hacks to do it. Here's what that code looks like:

body { font-size: 75%; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; color: #232323; background: url('img/styles/blue_bg.jpg') no-repeat center center fixed; -webkit-background-size: cover; -moz-background-size: cover; -o-background-size: cover; background-size: cover; filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/styles/blue_bg.jpgg', sizingMethod='scale'); -ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/img/styles/blue_bg.jpg', sizingMethod='scale')"; background-color: #00689c; height: 100%; }