.tooltip{
width: 200px; color:#FFFFFF;
font:lighter 13px/1.3 Arial,sans-serif;
text-decoration:none;text-align:center}

.tooltip span.top{padding: 35px 8px 0px;
    background: url(/images/bt.gif) no-repeat top}

.tooltip b.bottom{padding:8px 5px 3px;color: #E7E6E6;
    background: url(/images/bt.gif) no-repeat bottom}