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

.tooltip span.top{padding: 35px 8px 0; display: block;
    text-align:center;
    background: url(img/bt.gif) no-repeat top}

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