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>