.banner {
    margin: auto 0;
    width: 530px;
    overflow: hidden
}
.large_box img {
    display: block
}
.small_box {
    width:350px;
    height: 73px;
    overflow: hidden;
    margin: 0 auto;
}
.on {
    border: 1px solid #CCCCCC;
    opacity: 1 !important;
}
.small_list {
    position: relative;
    float: left;
    width: 480px;
    height: 64px;
    overflow: hidden
}
.small_list ul {
    height: 73px;
    overflow: hidden
}
.small_list ul li {
    position: relative;
    float: left;
    width: 64px
}
.small_list ul li img {
    display: block
}
.small_list ul li .bun_bg {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 110px;
    height: 73px;
    background: #000;
    filter: alpha(opacity=60);
    -moz-opacity: .6;
    -khtml-opacity: .6;
    opacity: .6
}
.small_list ul li.on .bun_bg {
    display: block
}
.btn {
    display: block;
    width: 20px;
    height: 64px;
    opacity: 0.3;
    background-color: #ccc;
    background-repeat: no-repeat;
    background-position: center center;
    cursor: pointer;
}
.btn:hover {
    background-color: #E90000;
    opacity: 1;
}
.left_btn {
    float: left;
    margin-right: 25px;
    background-image: url(../images/left_btn.png)
}
.right_btn {
    float: right;
    margin-left: 15px;
    background-image: url(../images/right_btn.png)
}