sprites.css

.button {
	display: block;
	width: 250px;
	height: 250px;
	background-image: url('sprite.gif');
	background-repeat: no-repeat;
	overflow:hidden;
	text-indent:100%;
	white-space: nowrap;
}

.button:hover {
	background-position: -250px 0;
}

.button:active {
	background-position: -500px 0;
}