.hidden_tooltip {
     display: none;
}

span.visible_tooltip {
     display: block;
     position: absolute;
     top: 10px;
     left: 21px;
     width: 300px;
     font-size: 9px;;
     padding-left: 5px;
     padding-right: 5px;
     border: 1px solid black;
     background-color: #FFFFCC;
     text-decoration: none;
     color: #000000;
     z-index: 10;
}

a {
     text-decoration: none;
}

span {z-index =100;
     
}

img,table {
     z-index: 1;
}

.tooltipSource {
     position: relative;
}