a.tt span{ 
	display:none;
} 
a.tt:hover{ 
	position:relative;
	z-index:23;
} 
a.tt:hover span{ 
	display:block;
	position:absolute; 
	top:-10px; 
	left:20px;
	z-index:22;
	font-size: 10px;
	font-weight: none;
	color: black;
	background:#ffffe1;
	border: 1px solid gray;
	padding: 3px;
}