.tooltip{
width: 200px; color:#4d4d4d;
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:#7177a7;
    background: url(images/bt.gif) no-repeat bottom}