a.annotation {
  position: absolute;
  border: 2px hidden;
  padding: 0;
  display: block;
}
a.annotation span {
  display: block;
  background-color: white;
  width: 80%;
  height: 80%;
  opacity: 0.0;
  -moz-opacity: 0.0;
  filter:alpha(opacity=0);
}
a.annotation:hover {
  border: 2px solid rgb(0,0,255);
  border-color: rgb(0,0,255);
}
img.annotated {
  border-width: 0;
}