(function($) {
	$.fn.extend({
		Scroll: function(opt, callback) {
			//参数初始化
			if (!opt) var opt = {};
			var _btnUp = $("#" + opt.up); //Shawphy:向上按钮
			var _btnDown = $("#" + opt.down); //Shawphy:向下按钮
			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
			var scrollUp = function() {
				_btnUp.unbind("click", scrollUp); //Shawphy:取消向上按钮的函数绑定
				_this.animate({
					marginTop: upHeight
				},
				speed,
				function() {
					for (i = 1; i <= line; i++) {
						_this.find("li:first").appendTo(_this);
					}
					_this.css({
						marginTop: 0
					});
					_btnUp.bind("click", scrollUp); //Shawphy:绑定向上按钮的点击事件
				});

			}
			//Shawphy:向下翻页函数
			var scrollDown = function() {
				_btnDown.unbind("click", scrollDown);
				for (i = 1; i <= line; i++) {
					_this.find("li:last").show().prependTo(_this);
				}
				_this.css({
					marginTop: upHeight
				});
				_this.animate({
					marginTop: 0
				},
				speed,
				function() {
					_btnDown.bind("click", scrollDown);
				});
			}
			//Shawphy:自动播放
			var autoPlay = function() {
				if (timer) timerID = window.setInterval(scrollUp, timer);
			};
			var autoStop = function() {
				if (timer) window.clearInterval(timerID);
			};
			//鼠标事件绑定
			_this.hover(autoStop, autoPlay).mouseout();
			_btnUp.css("cursor", "pointer").click(scrollUp).hover(autoStop, autoPlay); //Shawphy:向上向下鼠标事件绑定
			_btnDown.css("cursor", "pointer").click(scrollDown).hover(autoStop, autoPlay);

		}
	})
})(jQuery);

$(document).ready(function(){
        $("#scrollDiv").Scroll({line:3,speed:500,timer:3000});
});