jquery 动态滚动

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<script type="text/javascript">        //滚动插件        (function ($) {            $.fn.extend({                Scroll: function (opt, callback) {                    //参数初始化                    if (!opt) var opt = {};                    var _this = this.eq(0).find("#scrollDivContent:first");                    var lineH = _this.find(".syhybox:first").outerHeight(), //获取行高                 line = opt.line ? parseInt(opt.line, 10) : parseInt(this.height() / lineH, 10), //每次滚动的行数，默认为一屏，即父容器高度                 speed = opt.speed ? parseInt(opt.speed, 10) : 1000, //卷动速度，数值越大，速度越慢（毫秒）                 timer = opt.timer ? parseInt(opt.timer, 10) : 500; //滚动的时间间隔（毫秒）                    if (line == 0) line = 1;                    var upHeight = 0 - line * lineH;                    //滚动函数                    scrollUp = function () {                        _this.animate({                            marginTop: upHeight                        }, speed, function () {                            for (i = 1; i <= line; i++) {                                _this.append(_this.find(".syhybox:first")[0]);                                upHeight = 0 - _this.find(".syhybox:first").outerHeight();                            }                            _this.css({ marginTop: 0 });                        });                    }                    //鼠标事件绑定                    _this.hover(function () {                        clearInterval(timerID);                    }, function () {                        timerID = setInterval("scrollUp()", timer);                    }).mouseout();                }            })        })(jQuery);          $(document).ready(function () {            $("#scrollDiv").Scroll({ line: 1, speed: 1000, timer: 2000 });        });    </script>   <div id="scrollDiv">     <div id="scrollDivContent">         <%=hiddenDangerList%>     </div> </div>