.mw_blank {
  background: url(/wws/image/icon_blank_mw1712.png) right center no-repeat;
  padding-right: 13px;
  position: relative;
}
.mw_blank:after {
  position:absolute;
  top:0;
  right: 0;
  content : "New Window";
  display : block;
  width : 0;
  height : 0;
  text-indent: 100%;
  white-space: nowrap;
  overflow:hidden;
}