body {
	margin: 0;
	padding: 0;
	background-color: #FFF;
	background-image: url(../img/background.gif);
	background-repeat: repeat;
	}
	
#center_div {
	width: 642px;
	height: 288px;
	top: 50%;
	left: 50%;
	margin-top: -144px;
	margin-left: -321px;
	position: absolute;
	z-index: -1;
	background-color: #FFF;
	text-align: center;
}