.jar_download_link {
  display: block;
  float: right;
  width: 90px;
  height:70px;
  text-indent: -5000px;
  overflow: hidden;
  background: url(../images/sprite_download2.png) no-repeat bottom left;
}


.jar_download_link:hover {
  background: url(../images/sprite_download2.png) no-repeat top left;
}