window.onscroll = function fWinScroll() {
    var iScrollTop = document.documentElement.scrollTop;
    var iWinScreenHeight = document.documentElement.clientHeight;
    var oObj = document.getElementById("Comment_GoTop");
    if (oObj) {
        if (iScrollTop > iWinScreenHeight / 4) {
            oObj.style.display = "block";
            oObj.style.top = (iScrollTop +iWinScreenHeight-160)+ "px";
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        else {
            oObj.style.display = "none";
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}


function fScrollBodyTo(iTop) {
    if (document.documentElement.scrollTop)
        document.documentElement.scrollTop = iTop;
    else if (document.body.scrollTop)
        document.body.scrollTop = iTop;
    else if (window.pageYOffset)
        window.pageYOffset = iTop;
}