.tooltip {
width: 200px; color:#000;
font:lighter 10px/1.3 verdana;
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 
}