a.info{
    position:relative; /*this is the key*/
    z-index:24; background-color:#eaeaea;
    color:#000000;
    text-decoration:none;}

a.info:hover{z-index:25; background-color:#ffcc00}

a.info span{display: none}

a.info:hover span{ /*the span will display just on :hover state*/
    display:block;
    position:absolute;
    top:2em; left:2em; width:15em;
    border:1px solid #cc0000;
    background-color:#f5f5f5;
    color:#000000;
    padding:3px}