.focus {width:100%; height:200px; overflow:hidden; position:relative;}
.focus ul {height:380px; position:absolute;}
.focus ul li img{
   width:1000px;
   height:200px;
}
.focus ul li {float:left; width:1000px; height:200px; overflow:hidden; position:relative; background:#000;}
.focus ul li div {position:absolute; overflow:hidden;}
.focus .btnBg {position:absolute; width:800px; height:20px; left:0; bottom:0; background:#000; display:none;}
.focus .btn {
    bottom: 6px;
    height: 18px;
    padding: 0 10px;
    position: absolute;
    right: 423px;
    text-align: center;
    width: 155px;
}
.focus .btn span {
    cursor: pointer;
    display: inline-block;
    height: 13px;
    line-height: 13px;
    margin-left: 5px;
    text-align: center;
    width: 13px;
    border-radius: 13px;
    background:#fff;
}
.focus .btn span.on {background:#379FEE;color:#fff}
.focus .preNext {width:45px; height:100px; position:absolute; top:90px; background:url(img/sprite.png) no-repeat 0 0; cursor:pointer;}
.focus .pre {left:0;}
.focus .next {right:0; background-position:right top;}