(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);