.viewer {
	margin: 5px auto;
	width: 910px;
	height: 430px;
	text-align: left;
	overflow: hidden;
}

.viewer ul {
	width: 910px;
	height: 430px;
	text-align: left;
	overflow: hidden;
	position: relative;
}

.viewer ul li {
	top: 0;
	left: 0;
	width: 910px;
	height: 430px;
	display: none;
	position: absolute;
}