@charset "utf-8";

a.tooltip{
    position:relative; /*this is the key*/
    z-index:24;
    text-decoration:none}

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

a.tooltip span{display: none}

a.tooltip:hover span{ /*the span will display just on :hover state*/
    display:block;
    position:absolute;
    top:2em; left:2em; width:15em;
    border:1px solid #EEEEEE;
    background-color:#FFFFCC; color:#000000;
    text-align: center}