(function($) {
    $.fn.extend({
        Scroll: function(opt, callback) {
            //参数初始化
            if (!opt) var opt = {};
            var contariner = this;
            var timerID;
            var _this = this.eq(0).find("ul:first");
            var lineH = _this.find("li:first").height(), //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) : 500, //卷动速度，数值越大，速度越慢（毫秒）
                     timer = opt.timer ? parseInt(opt.timer, 10) : 3000; //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(tg, h) {
                var ul = $(tg).eq(0).find("ul:first");
                ul.animate({
                    marginTop: h
                }, speed, function() {
                    for (i = 1; i <= line; i++) {
                        ul.find("li:first").appendTo(ul);
                    }
                    ul.css({ marginTop: 0 });
                });
            }
            //鼠标事件绑定
            contariner.hover(function() {
                clearInterval(timerID);
            }, function() {
                timerID = setInterval("scrollUp('#" + contariner[0].id + "'," + upHeight + ")", timer);
            }).mouseout();
        }
    })
})(jQuery);