#box1{
	position:absolute;
	margin-left:0px;
	width:5000px;
	height:52px;
	overflow:hidden;
}

#box1 span{
	display:block;
	float:left;
}

.mask1{
	position:relative;
	width:780px;
	height:52px;
	overflow:hidden;
	margin-left:10px;
}