/* Sample 1*/
#box1{
	position:absolute;
	left: 0px;
	top: 0px;
	width: 501px;
	height:272px;
	overflow: hidden;
}
#box1 span{
	display:block;
	float:left; }


.mask1{
	position:relative;
	float:left;
	width:501px;
	height:272px;
	overflow: hidden;
}

#banner_imagen {
	float:left;
	width:501px;
	height:272px; }