.scrollable{
	position:absolute;
	overflow:hidden;
	width: 100%;
	height:280px;
	left:25px;
	top:135px;
}
.scrollable .items {
	/* this cannot be too large */
	width:20000em;
	position:absolute;
	clear:both;
	
}
.scrollable .items2 {
	/* this cannot be too large */
	width:20000em;
	position:absolute;
	clear:both;
	
}

.scrollable div {
	float:left;
}
.cont_obra{
	position:relative;
	width:450px;
	height:280px;
	margin-right:3px;
}
.scrollable .active {
	border:2px solid #000;
	z-index:9999;
	position:relative;
}
#previo{
	position:absolute;
	left:30px;
	top:220px;
	z-index:500;
	visibility:hidden;
}
#siguiente{
	position:absolute;
	right:5px;
	top:220px;
	z-index:500;
	visibility:hidden;
}
#previo2{
	position:absolute;
	left:30px;
	top:220px;
	z-index:500;
	visibility:hidden;
}
#siguiente2{
	position:absolute;
	right:5px;
	top:220px;
	z-index:500;
	visibility:hidden;
}