a.tooltip{
  position:relative; 
  padding:0;
  text-decoration:none;
  cursor:help; 
  z-index:24;
  font-size:12px;
  }
  a.tooltip:hover{
  background:transparent;
  z-index:25; 
  text-decoration:none;
  }
  a.tooltip span {
  display: none;
  text-decoration:none;
  }
  
  a.tooltip:hover span { 
  display:block;
  text-decoration:none;
  position:absolute;
  top:3em;
  left:0;
  font-family:"tahoma"; 
  padding:5px 10px;
  border:1px solid #dfdfde;
  background:#f7f7f7; 
  color:#868686;
  filter: alpha(opacity=90);
  opacity: .9;
 }