header,menu,main,footer,system {
	margin:0 auto;
	z-index:99; position:relative;	
}
.page-background { position:fixed; top:0px; left:0px; width:100%; height:100%; z-index:1; }
.page-background-2 { position:fixed; top:0px; left:0px; width:100%; height:100%; z-index:2; }