.galeria ul > li > a:hover span.seta
{
  background: url("../layout/nmaster_sprite.png") no-repeat scroll -903px -98px transparent;
  display: block;
  height: 68px;
  cursor: pointer;
  left: 36%;
  position: absolute;
  top: 29%;
  width: 69px;
}
.galeria .fotos > span {
  background: url("../layout/nmaster_sprite.png") no-repeat scroll -63px -68px transparent;
  display: inline-block;
  height: 10px;
  margin-right: 3px;
  width: 14px;
  #vertical-align: middle;
}