.tooltip{
	width: 200px;
	color:#ffffff;
	text-decoration:none;
	text-align:center;
}

.tooltip span.top {
	padding: 30px 8px 0;
	background: url(http://www.omnium.cat/docroot/omnium/imgs/bt.gif) no-repeat top;
}

.tooltip b.bottom {
	padding:3px 8px 10px;
    background: url(http://www.omnium.cat/docroot/omnium/imgs/bt.gif) no-repeat bottom;
}