#goTopBtn {
    position: fixed;
    text-align: center;
    line-height: 30px;
    width: 30px;
    bottom: 35px;
    height: 33px;
    font-size: 12px;
    cursor: pointer;
    right:30px;
    margin-left: 610px;}
#goTopBtn a { background:url(../images/lanren_top.jpg) 0 0 no-repeat; width:30px; height:30px; display:block;}
#goTopBtn a:hover { background:url(../images/lanren_top.jpg) 0 -30px no-repeat; }