.roll {
	border: 0;
	margin: 0;
	padding: 0;
	width: 120px;
	height: 30px;
	overflow: hidden;
}

.roll img {
	visibility: hidden;
}

.roll a,
.roll a:link,
.roll a:visited {
	background-position: 0px 0px;
	float:left;
}
.roll a:focus,
.roll a:hover,
.roll a:active {
	background-position: 0px 30px;
	float:left;
}

.roll .buy a { background-image: url(img/buy.gif); }