div随页面滚动 位置固定问题js代码discuz教程

<script type="text/javascript">    window.onload=        function(){            var oDiv = document.getElementById("fixPara"),                H = 0,                Y = oDiv                    while (Y) {                H += Y.offsetTop;                 Y = Y.offsetParent;            }            window.onscroll = function()            {                var s = document.body.scrollTop || document.documentElement.scrollTop                if(s>H) {                    oDiv.style = "position:fixed;top:60px;left: 963px;"                } else {                    oDiv.style = "position:static;"                }            }        }</script>