.nav{
    width: 171px;
    height: 517px;
    background: url(../tg_img/navbg.png) no-repeat;
    position: fixed;
    top: 0;
    right: 20px;
    z-index: 99;
}
.navul{
    width: 126px;
    height: 236px;
    margin-left: 23px;
    margin-top: 70px;
}
.navul li{
    height: 47px;
    cursor: pointer;
}
.navli1{
    height: 100%;
    background: url(../tg_img/img.png) no-repeat;
    background-position: -255px -107px;
}
.navli2{
    height: 100%;
    background: url(../tg_img/img.png) no-repeat;
    background-position: -255px -154px;
}
.navli3{
    height: 100%;
    background: url(../tg_img/img.png) no-repeat;
    background-position: -255px -201px;
}
.navli4{
    height: 100%;
    background: url(../tg_img/img.png) no-repeat;
    background-position: -255px -248px;
}
.navli5{
    height: 100%;
    background: url(../tg_img/img.png) no-repeat;
    background-position: -255px -295px;
}
.navul li:hover{
    background: url(../tg_img/img.png) no-repeat;
    background-position: -274px -18px;
}
.ewm{
    display: block;
    margin-left: 23px;
    margin-top: 5px;
}
.back{
    width: 84px;
    height: 34px;
    background: url(../tg_img/img.png) no-repeat;
    background-position: -263px -406px;
    margin-left: 46px;
    margin-top: 10px;
    cursor: pointer;
}