a.info
{
   position: relative;
   z-index: 24;
   background-color: #ccc;
   color: #000;
   text-decoration: none;
}

a.info:hover
{
   z-index: 25;
   background-color: #ff0;
}

a.info span
{
   display: none;
}

a.info:hover span{ /*the span will display just on :hover state*/
   display: block;
   position: absolute;
   top: 2em; left: 0.5em; width: 15em;
   border: 1px solid #0cf;
   background-color: #cff;
   color: #000;
   text-align: center;
}