var $ = function (id) {
	 return "string" == typeof id ? document.getElementById(id) : id;
	};
	var Extend = function(destination, source) {
	 for (var property in source) {
	  destination[property] = source[property];
	 }
	 return destination;
	}
	var CurrentStyle = function(element){
	 return element.currentStyle || document.defaultView.getComputedStyle(element, null);
	}
	var Bind = function(object, fun) {
	 var args = Array.prototype.slice.call(arguments).slice(2);
	 return function() {
	  return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));
	 }
	}
	var Tween = {
	 Quart: {
	  easeOut: function(t,b,c,d){
	   return -c * ((t=t/d-1)*t*t*t - 1) + b;
	  }
	 },
	 Back: {
	  easeOut: function(t,b,c,d,s){
	   if (s == undefined) s = 1.70158;
	   return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
	  }
	 },
	 Bounce: {
	  easeOut: function(t,b,c,d){
	   if ((t/=d) < (1/2.75)) {
		return c*(7.5625*t*t) + b;
	   } else if (t < (2/2.75)) {
		return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
	   } else if (t < (2.5/2.75)) {
		return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
	   } else {
		return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
	   }
	  }
	 }
	}
	//容器对象,滑动对象,切换数量
	var SlideTrans = function(container, slider, count, options) {
	 this._slider = $(slider);
	 this._container = $(container);//容器对象
	 this._timer = null;//定时器
	 this._count = Math.abs(count);//切换数量
	 this._target = 0;//目标值
	 this._t = this._b = this._c = 0;//tween参数
	 
	 this.Index = 0;//当前索引
	 
	 this.SetOptions(options);
	 
	 this.Auto = !!this.options.Auto;
	 this.Duration = Math.abs(this.options.Duration);
	 this.Time = Math.abs(this.options.Time);
	 this.Pause = Math.abs(this.options.Pause);
	 this.Tween = this.options.Tween;
	 this.onStart = this.options.onStart;
	 this.onFinish = this.options.onFinish;
	 
	 var bVertical = !!this.options.Vertical;
	 this._css = bVertical ? "top" : "left";//方向
	 
	 //样式设置
	 var p = CurrentStyle(this._container).position;
	 p == "relative" || p == "absolute" || (this._container.style.position = "relative");
	 this._container.style.overflow = "hidden";
	 this._slider.style.position = "absolute";
	 
	 this.Change = this.options.Change ? this.options.Change :
	  this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;
	};
	SlideTrans.prototype = {
	  //设置默认属性
	  SetOptions: function(options) {
	 this.options = {//默认值
	  Vertical: true,//是否垂直方向（方向不能改）
	  Auto:  true,//是否自动
	  Change:  0,//改变量
	  Duration: 10,//滑动持续时间
	  Time:  10,//滑动延时
	  Pause:  4000,//停顿时间(Auto为true时有效)
	  onStart: function(){},//开始转换时执行
	  onFinish: function(){},//完成转换时执行
	  Tween:  Tween.Quart.easeOut//tween算子
	 };
	 Extend(this.options, options || {});
	  },
	  //开始切换
	  Run: function(index) {
	 //修正index
	 index == undefined && (index = this.Index);
	 index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);
	 //设置参数
	 this._target = -Math.abs(this.Change) * (this.Index = index);
	 this._t = 0;
	 this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? "top" : "left"]);
	 this._c = this._target - this._b;
	 
	 this.onStart();
	 this.Move();
	  },
	  //移动
	  Move: function() {
	 clearTimeout(this._timer);
	 //未到达目标继续移动否则进行下一次滑动
	 if (this._c && this._t < this.Duration) {
	  this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration)));
	  this._timer = setTimeout(Bind(this, this.Move), this.Time);
	 }else{
	  this.MoveTo(this._target);
	  this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause));
	 }
	  },
	  //移动到
	  MoveTo: function(i) {
	 this._slider.style[this._css] = i + "px";
	  },
	  //下一个
	  Next: function() {
	 this.Run(++this.Index);
	  },
	  //上一个
	  Previous: function() {
	 this.Run(--this.Index);
	  },
	  //停止
	  Stop: function() {
	 clearTimeout(this._timer); this.MoveTo(this._target);
	  }
	};