(function ($) {
			$.fn.extend({
				Scroll: function (opt, callback) {
					if (!opt) var opt = {};
					var _this = this.eq(0).find("ul:first");
					var lineH = _this.find("li:first").height(),
line = opt.line ? parseInt(opt.line, 10) : parseInt(this.height() / lineH, 10),
speed = opt.speed ? parseInt(opt.speed, 10) : 3000, //卷动速度，数值越大，速度越慢（毫秒）
timer = opt.timer ? parseInt(opt.timer, 10) : 1000; //滚动的时间间隔（毫秒）
					if (line == 0) line = 1;
					var upHeight = 0 - line * lineH;
					scrollUp = function () {
						_this.animate({
							marginTop: upHeight
						}, speed, function () {
							for (i = 1; i <= line; i++) {
								_this.find("li:first").appendTo(_this);
							}
							_this.css({ marginTop: 0 });
						});
					}
					_this.hover(function () {
						clearInterval(timerID);
					}, function () {
						timerID = setInterval("scrollUp()", timer);
					}).mouseout();
				}
			})
		})(jQuery);