.pager{
  display: block;
  background-image: url("../img/pager_dis.png");
  width: 16px;
  height: 16px;
  float: left;
  cursor:pointer;
  margin: 11px 4px 11px 4px;
}

.views_slideshow_pager_field_item.active .pager{
  background-image: url("../img/pager_en.png");
}