/* tooltip styles */
div#tooltip {
   position:absolute;
   visibility:hidden;
   z-index:100;
   background-color:#000;
   border:2px solid #000;
   padding:0.2em;
   font-size:11px;
   color:white;
   width:140px;
   opacity: 0.75; 
	filter:alpha(opacity=75);
}