.jssora21l, .jssora21r {
    display: block;
    position: absolute;
    width: 55px;
    height: 55px;
    cursor: pointer;
    background: url("../images/a21.png") center center no-repeat;
    overflow: hidden;
}

.jssora21l {
    background-position: -3px -33px;
}

.jssora21r {
    background-position: -63px -33px;
}

.jssora21l:hover {
    background-position: -123px -33px;
}

.jssora21r:hover {
    background-position: -183px -33px;
}

.jssora21l.jssora21ldn {
    background-position: -243px -33px;
}

.jssora21r.jssora21rdn {
    background-position: -303px -33px;
}

.jssorb21 {
    position: absolute;
}

    .jssorb21 div, .jssorb21 div:hover, .jssorb21 .av {
        position: absolute;
        /* size of bullet elment */
        width: 19px;
        height: 19px;
        text-align: center;
        line-height: 19px;
        color: #f00;
        font-size: 12px;
        background: url("../images/b21.png") no-repeat;
        overflow: hidden;
        cursor: pointer;
    }

    .jssorb21 div {
        background-position: -5px -5px;
    }

        .jssorb21 div:hover, .jssorb21 .av:hover {
            background-position: -35px -5px;
        }

    .jssorb21 .av {
        background-position: -65px -5px;
    }

    .jssorb21 .dn, .jssorb21 .dn:hover {
        background-position: -95px -5px;
    }