.tooltip{
width: 80px; color:#fff;
font:lighter 11px/1.3 Arial,sans-serif;
text-decoration:none;text-align:center}

.tooltip span.top{padding: 20px 8px 0;
    background: url(bt.png) no-repeat top}

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