/* CSS Document */

.backToTop {

    display: none;

    width: 18px;

    line-height: 1.2;

    padding: 5px 0;

    background-color: #06F;

    color: #fff;

    font-size: 12px;

    text-align: center;

    position: fixed;

    _position: absolute;

    right: 10px;

    bottom: 50px;

    _bottom: "auto";

    cursor: pointer;

    opacity: .6;

    filter: Alpha(opacity=80);

}



/*默认样式，主要是position:fixed实现屏幕绝对定位*/

#gotoTop{display:none;position:fixed;top:75%;left:50%;cursor:pointer;margin-top:-50px;margin-left:520px;padding:9px 4px;width:20px;text-align:center;border:1px solid #e0e0e0;background:#fff;}

/*用CSS表达式(expression)来实现ie6下position:fixed效果*/

#gotoTop{_position:absolute;_top:expression(documentElement.scrollTop + documentElement.clientHeight * 3/4 + "px")}

/*鼠标进入的反馈效果*/

#gotoTop.hover{background:#5CB542;color:#fff;text-decoration:none;}