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:			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);
	}
};

//ʵÀý»¯
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 slide2 = new SlideTrans("idContainer2", "idSlider2", 3, { Vertical: true });

var menulinks = [];
menulinks = $("menu").getElementsByTagName("A");
//alert(menus.length)
forEach(menulinks, function(ooo, iii){
	ooo.onmouseover = function(){ ooo.className = "on"; slide2.Auto = false; slide2.Run(iii); }
	ooo.onmouseout = function(){ ooo.className = ""; slide2.Auto = true; slide2.Run(); }
})

slide2.onStart = function(){
	forEach(menulinks, function(ooo, iii){ ooo.className = slide2.Index == iii ? "on" : ""; })
}

function addLoad(fun){
	if(old = window.onload){
		window.onload = function(){
			old();
			fun();
		}
	}else{
		window.onload = function(){
			fun();
		}
	}
}


function addRun(){
	$("loading").style.display = 'none';
	slide2.Run();
}

//addLoad(addRun)
	//slide2.Run();