(function($){ 
$.fn.extend({ 
Scroll:function(opt,callback){ 
//参数初始化 
if(!opt) var opt={}; 
var _btnRight = $("#"+ opt.right);//Shawphy:向上按钮 
var _btnLeft = $("#"+ opt.left);//Shawphy:向下按钮 
var timerID; 
var _this=this.eq(0).find("ul:first"); 
var lineW=_this.find("li:first").width(), //获取行高 
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;

var scrollRight=function(){  
_btnRight.unbind("click",scrollRight); //Shawphy:取消向右按钮的函数绑定 
_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); //Shawphy:绑定向右按钮的点击事件
});                 
}                
//Shawphy: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); 
});            
}
//Shawphy: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).mouseout(); 
_btnRight.css("cursor","pointer").click( scrollRight  ).hover(autoStop,autoPlay);//Shawphy:向上向下鼠标事件绑定 
_btnLeft.css("cursor","pointer").click( scrollLeft ).hover(autoStop,autoPlay); 
} 
}) 
})(jQuery);

$(document).ready(function(){ 
$("#List1_1").Scroll({line:4,speed:500,timer:20000,right:"btn1",left:"btn2"}); 
});