#share .facebook, #share .twitter, #share .email, #share .rss {
  background:url(sprites-share.png) no-repeat 0 0;
  display:block;
  width:17px;
  height:17px;
  text-indent:-10000px;
  float:left;
  margin:5px;
}
#share .facebook { background-position:0 0px; }
#share .twitter { background-position: -20px 0px; }
#share .email { background-position:-40px 0px; }
#share .rss { background-position:-60px 0px; }