.tooltip {
    width: 200px;
    color:#000;
    font:lighter 11px/1.3 Arial,sans-serif;
    text-decoration:none;
    text-align:center;
}

.tooltip span.top {
    padding: 30px 8px 0;
    background: url(/images/bt.gif) no-repeat top;
}

.tooltip b.bottom {
    padding:3px 8px 15px;
    color: #548912;
    background: url(/images/bt.gif) no-repeat bottom;
}