.viewer {

	width: 880px;
	height: 450px;
	text-align: left;
	
}

.viewer ul {
	width: 880px;
	height: 450px;
	text-align: left;
	overflow: hidden;
	position: relative;
}

.viewer ul li {
	top: 0;
	left: 0;
	width: 880px;
	height: 450px;
	display: none;
	position: absolute;
}