.creditBtn {
    z-index: 200;
    width: 130px;
    height: 33px;
    position: absolute;
    margin: 154px 0 0 323px;
    display: block;
    background: url('/images/btn-credit.png') bottom;
    background-position: 0 0;
    text-indent: -99999px;
}

.creditBtn:hover {
    background-position: 0 33px;
}