.addthis {
  font: bold  9px  Verdana, Arial, Helvetica, sans-serif;
  color: #a9aaab;
  text-decoration: none;
  background-image: url(http://s7.addthis.com/custom/theknot/icn_bookmark.gif);
  background-repeat: no-repeat;
  padding-left: 16px;
}
.addthis:hover{
  text-decoration: none; 
  font-weight: bold; 
  color: #7faad6;
  background: url(http://s7.addthis.com/custom/theknot/icn_bookmark_over.gif);
  background-repeat: no-repeat;
}