a.rollover {
display: block;
width: 150px;
height: 44px;
text-decoration: none;
background: url("http://static.squarespace.com/static/52681e94e4b02ae7c37c87d2/t/527c6588e4b0c8e59c805dbf/1383884168638/rollover%20image%20test.JPG");
}

a.rollover:hover {
background-position: -150px 0;
}

.displace {
position: absolute;
left: -5000px;
}