var SlideTrans = function(container, slider, count, options) {
	this._slider = $(slider);
	this._container = $(container);//container
	this._timer = null;//timer
	this._count = Math.abs(count);//count
	this._target = 0;// 
	this._t = this._b = this._c = 0;//tween 
	
	this.Index = 0;//index No.
	
	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";// 
	
	//stlye
	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 = {
  //defualt
  SetOptions: function(options) {
	this.options = {// 
		Vertical:	true,//vertical 
		Auto:		true,//auto
		Change:		0,// 
		Duration:	50,//slider time
		Time:		10,//time
		Pause:		18000,// )
		onStart:	function(){},// 
		onFinish:	function(){},// 
		Tween:		Tween.Quart.easeOut//tween 
	};
	Extend(this.options, options || {});
  },
  //start 
  Run: function(index) {
	// 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();
  },
  //move
  Move: function() {
	clearTimeout(this._timer);
	// 
	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));
	}
  },
  // 
  MoveTo: function(i) {
	this._slider.style[this._css] = i + "px";
  },
  // 
  Next: function() {
	this.Run(++this.Index);
  },
  // 
  Previous: function() {
	this.Run(--this.Index);
  },
  // 
  Stop: function() {
	clearTimeout(this._timer); this.MoveTo(this._target);
  }
};