.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;
    }