.topo {
	overflow: hidden !important;
	width: 900px;
	height: 400px;
}
.topo > div {
	position: absolute;
	width: 900px;
	height: 400px;
	z-index: 0;
	display: none;
	overflow: hidden !important;
}
.topo > div.anterior {
	display: block;
	z-index: 1;
}
.topo > div.atual {
	display: block;
	z-index: 2;
	overflow: hidden !important;
}