td.entete {
 vertical-align: top;
 background-color: #ffffff;
 text-align: left;
 font-weight: bold;
}

td.cellule {
 vertical-align: top;
 background-color: #ffffff;
 text-align: left;
 font-weight: bold;
}

a.info span {
 display:none;
 width:300px;
}
 
a.info:hover span {
 display:block;
 position:absolute;
 width:300px;
 border:1px solid #000;
 background-color:#FFF;
 color:#000;
 text-align: left;
 font-weight:normal;
 font-weight:none;
 padding:5px;
}