#wrapper {
	width:100%;
	height:100%;
	position:absolute;
	top:0;left:0;
	overflow:hidden;
}

	#mask {
		width: 6594px;
		height: 520px;
	}

	.item_box {
		width: 942px;
		height: 520px;
		float: left;
	}
	
	
	.content_box {
		width: 942px;
		height: 520px; 
		margin: 0 auto;
		position: relative;
	}