#comprar {
	position: relative;
	padding-top: 65px;
	padding-left: 250px;
}
#comprar a {
	display: block;
	height: 24px;
	width: 135px;
	text-indent: -3000px;
	background-position: left;
	margin-bottom: 66px;
}
#comprar a:hover {
	background-position: right;
}