@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document url(about:blank) {

html {
background: url("http://farm4.static.flickr.com/3154/2455978617_ca0d58b6ed_o.jpg" ) fixed rgb( 255 , 255 , 255) no-repeat center !important;
}
}