div#subkaart {
  background: url(/images/landkaart.jpg);
  width: 358px;
  height: 420px;
  position: absolute;
}

div.rondje, div.rondje_trans {
  position: absolute;
  width: 10px;
  height: 9px;
  background: url(/images/rondje.gif) no-repeat;
  cursor: pointer;
}

.trans {
  filter: alpha(opacity=20)
  -moz-opacity: .20;
  opacity: .20;
}