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;
   }
  }
 }
}


var SlideTrans = function(container, slider, count, options) {
 this._slider = $$(slider);
 this._container = $$(container);
 this._timer = null;
 this._count = Math.abs(count);
 this._target = 0;
 this._t = this._b = this._c = 0;
 
 this.Index = 0;
 
 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";
 
 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 = {
	SetOptions: function(options) {
	this.options = {
	Vertical: true,
	Auto:  true,
	Change:  0,
	Duration: 50,
	Time:  10,
	Pause:  5000,
	onStart: function(){},
	onFinish: function(){},
	Tween:  Tween.Quart.easeOut
};
 Extend(this.options, options || {});
  },

  Run: function(index) {

 index == undefined && (index = this.Index);
 index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);

 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: 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.Index=this.Index-1;
 this.Run( this.Index);
  },

  Stop: function() {
 clearTimeout(this._timer); this.MoveTo(this._target);
  }
};