/*returnTop*/
p#back-to-top{
    position:fixed;
    display:none;
    bottom:100px;
    right:0px;
}
p#back-to-top a{
    text-align:center;
    text-decoration:none;
    color:#000;
    display:block;
    width:64px;
}
p#back-to-top a span{
    background:transparent url('/images/lanren_top.jpg') no-repeat -0px 0px;
    display:block;
    height:50px;
    width:50px;
}
#back-to-top a:hover span{
    background:transparent url('/images/lanren_top.jpg') no-repeat 0px -52px;
    height:50px;
    width:50px;
}