function ifeng_Scroll(container, btnPrevious, btnNext){  
    this.IsAutoScroll = true; //是否自动滚动  
    this.IsSmoothScroll = true; //是否平滑连续滚动 平滑滚动:true 间隔滚动:false  
     this.PauseTime = 1000;  
    //间隔滚动时每次滚动间隔的时间。单位：毫秒。建议值：100--3000 适用于间隔滚动。  
    this.Direction = "N"; //滚动方向.向东：E，向北：N  
    this.ControllerType = "click";  
    //上一个和下一个按钮事件的触发方式:click为点击触发滚动 否则就是 鼠标按住按钮触发滚动。支持click 和mousedown两种模式  
     this.BackCall = null; //回调函数 滚动到末尾时执行  
     this.Step = 1; //步长 可以理解为速度1--10  
   
     this.Speed = 10;  
     this.container = container;  
   
    this.NextButton = this. $(btnNext);  
     this.PreviousButton = this. $(btnPrevious);  
     this.ScrollElement = this. $(container);  
     this.UlElement = this. $(container).getElementsByTagName('ul')[0]; //ul元素  
    this.UlElement.innerHTML += this.UlElement.innerHTML;  
  
     this.UlSpace; //ul的实际宽度  
    this.LiSpace;  
 }  
  
 ifeng_Scroll.prototype = {  
     lastpos: 0, curPos: 0, curTimeoutId: null, curIntervalScrollTimeoutId: null, ScrollElementPos: 0, $: function(element){  
         return document.getElementById(element);  
    }  
    , Init: function(){  
        this.UlSpace = this.Direction == "E" ? this.UlElement.offsetWidth : this.UlElement.offsetHeight; //ul的实际宽度  
         this.LiSpace = parseInt(this.UlSpace / this.UlElement.getElementsByTagName('li').length);  
        this.UlSpace = this.LiSpace * this.UlElement.getElementsByTagName('li').length;  
        this.Direction == "E" ? this. $(this.container).style.width = this.UlSpace + "px": this. $(this.container).style.height = this.UlSpace + "px";  
   
       //设置基础样式  
       this.ScrollElement.style.overflow = "visible";  
        this.ScrollElement.parentNode.style.overflow = "hidden";  
        this.Direction == "E" ? this.ScrollElement.style.width = "10000px": this.ScrollElement.style.height = "10000px";  
        this.UlElement.style.float = "left";  
  
       this.ScrollType = this.Direction == "E" ? "left" : "top";  
       this.Bind(this, this.PreviousButton, this.ControllerType, "Pre");  
       this.Bind(this, this.NextButton, this.ControllerType, "Next");  
 
         this.ScrollElement.onmouseover = this.GetFunction(this, "MouseOver");  
        this.ScrollElement.onmouseout = this.GetFunction(this, "MouseOut");  
   }  
     , Bind: function(_this, el, type, param){  
        if (el){  
            if (type == "click"){  
                el.onclick = this.GetFunction(this, param);  
            }  
             else{  
                el.onmousedown = this.GetFunction(this, "MouseDown", param);  
                el.onmouseup = this.GetFunction(this, "MouseUp");  
           }  
            el.onmouseover = this.GetFunction(this, "MouseOver");  
            el.onmouseout = this.GetFunction(this, "MouseOut");  
        }  
     }  
     , Start: function(){  
       if (!this.IsAutoScroll)  
             return ;  
        if (this.IsSmoothScroll){  
            this.SmoothScroll();  
        }  
         else{  
            this.IntervalScroll();  
        }  
     }  
     , Pause: function(){  
        clearTimeout(this.curTimeoutId);  
        clearTimeout(this.curIntervalScrollTimeoutId);  
    }  
    , MouseOver: function(){  
        clearTimeout(this.mouseoutTimeoutId);  
        this.mouseoverTimeoutId = setTimeout(this.GetFunction(this, "Pause"), 10);  
    }  
    , MouseOut: function(){  
        clearTimeout(this.mouseoverTimeoutId);  
        this.mouseoutTimeoutId = setTimeout(this.GetFunction(this, "Start"), 10);  
     }  
    , MouseDown: function(direction){  
        var _step;  
        var _to;  
       if (direction == "Pre"){  
            _step = this.Step * 2;  
             curPos = parseInt(this.ScrollElement.style[this.ScrollType]);  
            if (!curPos)  
                curPos = 0;  
            if (curPos == 0){  
              this.ScrollElement.style[this.ScrollType] =  - this.UlSpace / 2+"px";  
               this.curPos =  - this.UlSpace / 2;  


           }  
            _to = 0;  
       }  
         else{  
             _step =  - this.Step * 2;  
            _to =  - this.UlSpace / 2;  
         }  
       moveParams = {  
             from: this.curPos, to: _to, step: _step, controller: "MouseDown:" + direction, callback: this.GetFunction(this, "ScrollFinish")  
          };  
          this.RunScroll(moveParams);  
     }  
     , MouseUp: function(){  
        clearTimeout(this.curTimeoutId);  
     }  
    , Pre: function(){  
        var curPos = parseInt(this.ScrollElement.style[this.ScrollType]);  
         if (!curPos)  
            curPos = 0;  
         var _to;  
        if (curPos == 0){  
           this.ScrollElement.style[this.ScrollType] =  - this.UlSpace / 2+"px";  
             this.curPos =  - this.UlSpace / 2;  
            _to =  - this.UlSpace / 2+this.LiSpace;  
        }  
        else{  
             _to = this.curPos % this.LiSpace == 0 ? this.curPos + this.LiSpace: parseInt(this.curPos / this.LiSpace) * this.LiSpace;  
       }  
         moveParams = {  
            from: this.curPos, to: _to, step: this.Step * 2, controller: "Previous", callback: this.GetFunction(this, "ScrollFinish")  
         };  
         this.RunScroll(moveParams);  
     }  
    , Next: function(){  
        _to = this.curPos % this.LiSpace == 0 ? this.curPos - this.LiSpace: (parseInt(this.curPos / this.LiSpace) - 1) * this.LiSpace;  
         moveParams = {  
            from: this.curPos, to: _to, step:  - this.Step * 2, controller: "Next", callback: this.GetFunction(this, "ScrollFinish")  
        };  
        this.RunScroll(moveParams);  
    }  
     , IntervalScroll: function(){  
         var _to = parseInt(this.curPos / this.LiSpace) * this.LiSpace - this.LiSpace;  
        var moveParams = {  
            from: this.curPos, to: _to, step:  - this.Step, controller: "IntervalScroll", callback: this.GetFunction(this, "ScrollFinish")  
         };  
         this.RunScroll(moveParams);  
    }  
    , SmoothScroll: function(){  
         var _to =  - this.UlSpace / 2;  
        var moveParams = {  
            from: this.curPos, to: _to, step:  - this.Step, controller: "SmoothScroll", callback: this.GetFunction(this, "ScrollFinish")  
         };  
        this.RunScroll(moveParams);  
     }  
    , RunScroll: function(params){  
         this.Scroll(params);  
      }  
     , Scroll: function(param){  
        var step = Math.abs(param.to - this.curPos) < Math.abs(param.step) ? param.to - this.curPos: param.step;  
        this.ScrollElement.style[this.ScrollType] = (param.from + step) + "px";  
        this.curPos = parseInt(this.ScrollElement.style[this.ScrollType]);  
        clearTimeout(this.curTimeoutId);  
       if (this.curPos != param.to){  
            var moveParams = {  
                 from: this.curPos, to: param.to, step: param.step, controller: param.controller, callback: param.callback  
          };  
            this.curTimeoutId = setTimeout(this.GetFunction(this, "Scroll", moveParams), this.Speed);  
       }  
        else{  
           if (param.callback)  
                param.callback();  
            if (param.controller == "SmoothScroll"){  
                this.SmoothScroll();  
            }  
             else if (param.controller == "IntervalScroll"){  
                if (this.curIntervalScrollTimeoutId)  
                     clearTimeout(this.curIntervalScrollTimeoutId);  
                this.curIntervalScrollTimeoutId = setTimeout(this.GetFunction(this, "IntervalScroll"), this.PauseTime);  
             }  
             else if (param.controller.indexOf("MouseDown") !=  - 1){  
               derection = param.controller.split(':')[1];  
               this.MouseDown(derection);  
           }  
       }  
    }  
     , ScrollFinish: function(){  
         if (this.curPos <=  - this.UlSpace / 2){  
            this.ScrollElement.style[this.ScrollType] = "0px";  
         }  
        else if (this.curPos >= 0){  
             this.ScrollElement.style[this.ScrollType] =  - this.UlSpace / 2+"px";  
        }  
         this.curPos = parseInt(this.ScrollElement.style[this.ScrollType]);  
         if (this.BackCall)  
            this.BackCall();  
     }  
    , GetFunction: function(variable, method, param){  
        return function(){  
             variable[method](param);  
        }  
    }  
}