var oo = 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 Class = {
  create: function() {
    return function() {
      this.initialize.apply(this, arguments);
    }
  }
}

var forEach = function(array, callback, thisObject){
	if(array.forEach){
	array.forEach(callback, thisObject);
	}
	else{
		for (var i = 0, len = array.length; i < len; i++) { callback.call(thisObject, array[i], i, array); }
	}
};

var Scroller = Class.create();
Scroller.prototype = {
  initialize: function(idScroller, idScrollMid, options) {

    this.SetOptions(options);
    this.Side = this.options.Side || ["up"];
    this.scroller = oScroller;
    this.speed = this.options.Speed;
    this.timer = null;
    //this.pauseHeight = 0;
    this.pauseWidth = 0;
    this.pause = 0;
    this.side = 0;
    this.widthScroller = parseInt(oScroller.style.width) || oScroller.offsetWidth;
    this.widthList = oScrollMid.offsetWidth;
    oScroller.style.overflow = "hidden";
    oScrollMid.appendChild(oScrollMid.cloneNode(true));
    oScrollMid.appendChild(oScrollMid.cloneNode(true));

    addEventHandler(oScroller, "mouseover", function() { oThis.Stop(); });
    addEventHandler(oScroller, "mouseout", function() { oThis.Start(); });

    this.Start();
  },
  SetOptions: function(options) {
    this.options = {
      Step:            1,
      Speed:        20,
      Side:            ["up"],
      PauseHeight:    0,
      PauseWidth:    0,
      PauseStep:    6000
    };
    Extend(this.options, options || {});
  },
  Turn: function() {
    this.Side.push(this.Side.shift().toLowerCase());
  },
  ScrollUpDown: function() {
    this.pause = this.pauseHeight;
    this.scroller.scrollTop = this.GetScroll(this.scroller.scrollTop, this.heightScroller, this.heightList, this.options.PauseHeight);
    this.pauseHeight = this.pause;

    var oThis = this;
    this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
  },
  ScrollLeftRight: function() {
    this.pause = this.pauseWidth;
    this.scroller.scrollLeft = this.GetScroll(this.scroller.scrollLeft, this.widthScroller, this.widthList, this.options.PauseWidth);
    this.pauseWidth = this.pause;

    var oThis = this;
    this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
  },
  GetScroll: function(iScroll, iScroller, iList, iPause) {
    var iStep = this.options.Step * this.side;

    if(this.side > 0){
        if(iScroll >= (iList * 2 - iScroller)){ iScroll -= iList; }
    } else {
        if(iScroll <= 0){ iScroll += iList; }
    }

    this.speed = this.options.Speed;
    if(iPause > 0){
        if(Math.abs(this.pause) >= iPause){
            this.speed = this.options.PauseStep; this.pause = iStep = 0; this.Turn();
        } else {
            this.pause += iStep;
        }
    }

    return (iScroll + iStep);
  },
  Start: function() {
    switch (this.Side[0].toLowerCase()) {
        case "right" :
            if(this.widthList < this.widthScroller) return;
            this.side = -1;
            this.ScrollLeftRight();
            break;
        case "left" :
            if(this.widthList < this.widthScroller) return;
            this.side = 1;
            this.ScrollLeftRight();
            break;
        case "down" :
            if(this.heightList < this.heightScroller) return;
            this.side = -1;
            this.ScrollUpDown();
            break;
        case "up" :
        default :
            if(this.heightList < this.heightScroller) return;
            this.side = 1;
            this.ScrollUpDown();
    }
  },
  Stop: function() {
    clearTimeout(this.timer);
  }
};

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 = oo(slider);
	this._container = oo(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:		3000,
		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.Run(--this.Index);
  },

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

window.onload = function(){
	var st = new SlideTrans("idContainer2", "idSlider2", 4, { Vertical: false });

	var nums = [];
	for(var i = 0, n = st._count - 1; i <= n;){
		(nums[i] = oo("idNum").appendChild(document.createElement("li"))).innerHTML = ++i;
	}

	forEach(nums, function(o, i){
		o.onmouseover = function(){ o.className = "on"; st.Auto = false; st.Run(i); }
		o.onmouseout = function(){ o.className = ""; st.Auto = true; st.Run(); }
	})
	st.onStart = function(){
		forEach(nums, function(o, i){ o.className = st.Index == i ? "on" : ""; })
	}
	

	st.Run();
};

function addEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.addEventListener) {
        oTarget.addEventListener(sEventType, fnHandler, false);
    } else {
        oTarget["on" + sEventType] = fnHandler;
    }
}