(function($){
$.fn.extend({
        Scroll:function(opt,callback){
                //参数初始化
                if(!opt) var opt={};
                var _btnRight = $("#"+ opt.right);
                var _btnLeft = $("#"+ opt.left);
                var timerID;
                var _this=this.eq(0).find("ul:first");
                var lineW=_this.find("li:first").width(), //获取列表宽度
                line=opt.line?parseInt(opt.line,10):parseInt(this.width()/lineW,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 rightWidth=0-line*lineW;
                //滚动函数
                var scrollRight=function(){
                        _btnRight.unbind("click",scrollRight);
                        _this.animate({
                                marginLeft:rightWidth
                        },speed,function(){
                                for(i=1;i<=line;i++){
                                        _this.find("li:first").appendTo(_this);
                                }
                                _this.css({marginLeft:0});
                                _btnRight.bind("click",scrollRight);
                        });

                }
                //向左翻页函数
                var scrollLeft=function(){
                        _btnLeft.unbind("click",scrollLeft);
                        for(i=1;i<=line;i++){
                                _this.find("li:last").show().prependTo(_this);
                        }
                        _this.css({marginLeft:rightWidth});
                        _this.animate({
                                marginLeft:0
                        },speed,function(){
                                _btnLeft.bind("click",scrollLeft);
                        });
                }
                //自动播放
                var autoPlay = function(){
                        if(timer)timerID = window.setInterval(scrollRight,timer);
                };
                var autoStop = function(){
                        if(timer)window.clearInterval(timerID);
                };
                 //鼠标事件绑定
                _this.hover(autoStop,autoPlay);
                //autoPlay();
                _btnRight.css("cursor","pointer").click( scrollRight ).hover(autoStop,autoPlay);
                _btnLeft.css("cursor","pointer").click( scrollLeft ).hover(autoStop,autoPlay);

        }      
})
})(jQuery);