.btnTwitterTweet a:hover, .btnTwitterTweet a:active, .btnTwitterTweet a:focus {
  background-position: 0 -21px;
}

.btnTwitterTweet a span {
  position: absolute;
  left: -5000px;
}

.btnTwitterTweet a {
  background: url("../images/tweet.png") no-repeat scroll 0 0 transparent;
  display: block;
  height: 20px;
  width: 55px;
  cursor: pointer;
}