a.button{
	float: left;
	height: 21px;
	padding-left: 18px;
	background: url(../images/buttons/bottone.png) no-repeat top left;
	text-decoration:none;
	color: #FFF;
	margin-right:10px;
	margin-top:5px;
	font-family: Arial, sans-serif;
	font-size: 11px;
	line-height: 21px;
	font-weight: bold;
}

a.button span{
	display: block;
	padding-right: 18px; 
    background: url(../images/buttons/bottone.png) no-repeat top right
}

a.button:hover{
	background-position: bottom left;
	color: #FFF;
}

a.button:hover span{
	background-position: bottom right
}