a.tooltip, a.tooltip:link, a.tooltip:visited, a.tooltip:active  {
  position: relative;
  text-decoration: none; 
  font-style: Verdana;
 
  }
  
a.tooltip:hover {

  background: transparent;
  }

a.tooltip span {
  display: none;  
  text-decoration: none; 
}

a.tooltip:hover span {
  display: block;
  position: absolute; 
  top: 32px; 
  left: 0; 
  width: 500px;
  z-index: 100;
  color: #000000; 
  border:1px dotted #474747; 
  background-image: url(bg_beschreibung_layer.png);
  font: 12px Verdana, sans-serif; 
  text-align: left;
  }