.ad-square-buttons {
    margin: 10px 0 0 0;
    padding-left:22px;
}

.ad-square-buttons a {
    display: block;
    float: left;
    line-height: 100%;
    margin: 1px;
    _margin: 0; /* IE6 */
}

.ad-square-buttons a img {
    display: inline;
}