.tooltip{
width: 200px; color:#000;
font:lighter 11px/1.3 Arial,sans-serif;
text-decoration:none;text-align:center; z-index:100;}

.tooltip span.top{padding: 17px 2px 2px 2px; 
    background: url(sponseredimg.gif) no-repeat top;width:158;height:23}