var gos = function (id) {return "string" == typeof id ? document.getElementById(id) : id;};

	var Class = {
		create: function() {return function() {this.initialize.apply(this, arguments);}}
	}
	Object.extend = function(destination, source) {
		for (var property in source) {destination[property] = source[property];}
		return destination;
	}

	var TransformView = Class.create();
	TransformView.prototype = {
		//容器对象,滑动对象,切换参数,切换数量
		initialize: function(container, slider, parameter, count, options) {
			if(parameter <= 0 || count <= 0) return;
			var oContainer = gos(container), oSlider = gos(slider), oThis = this;
		
			this.Index = 0;//当前索引
			
			this._timer = null;//定时器
			this._slider = oSlider;//滑动对象
			this._parameter = parameter;//切换参数
			this._count = count || 0;//切换数量
			this._target = 0;//目标参数
			
			this.SetOptions(options);
			
			this.Up = !!this.options.Up;
			this.Step = Math.abs(this.options.Step);
			this.Time = Math.abs(this.options.Time);
			this.Auto = !!this.options.Auto;
			this.Pause = Math.abs(this.options.Pause);
			this.onStart = this.options.onStart;
			this.onFinish = this.options.onFinish;
			
			oContainer.style.overflow = "hidden";
			oContainer.style.position = "relative";
			
			oSlider.style.position = "absolute";
			oSlider.style.top = oSlider.style.left = 0;
		},
		
		//设置默认属性
		SetOptions: function(options) {
			this.options = {//默认值
				Up:			false,//是否向上(否则向左)
				Step:		5,//滑动变化率
				Time:		10,//滑动延时
				Auto:		true,//是否自动转换
				Pause:		3000,//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
			};
			Object.extend(this.options, options || {});
		},
	  
		//开始切换设置
		Start: function() {
			if(this.Index < 0){ this.Index = this._count - 1;} else if (this.Index >= this._count){this.Index = 0;}
			this._target = -1 * this._parameter * this.Index;
			this.onStart();
			this.Move();
		},
	  
	  //移动
	  Move: function() {
		clearTimeout(this._timer);
		var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);

		if (iStep != 0) {
			this._slider.style[style] = (iNow + iStep) + "px";
			this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
		} else {
			this._slider.style[style] = this._target + "px";
			this.onFinish();
			if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }
		}
	  },
	  //获取步长
	  GetStep: function(iTarget, iNow) {
		var iStep = (iTarget - iNow) / this.Step;

		if (iStep == 0) return 0;
		if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
		return iStep;
	  },
	  //停止
	  Stop: function(iTarget, iNow) {
		clearTimeout(this._timer);
		this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
	  }
};

function Each(list, fun){for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }};

var slideStart = function(){
	if (gos("idNum")!= null){
		var objs = gos("idNum").getElementsByTagName("li");
		var tv = new TransformView("idTransformView", "idSlider", 910, objs.length, {
			onStart : function(){ Each(objs, function(o, i){o.className = tv.Index == i ? "on" : ""; })}
		});
		
		//添加鼠标控制
		Each(objs, function(o, i){
			o.onmouseover = function(){o.className = "on"; tv.Auto = false; tv.Index = i; tv.Start();}
			o.onmouseout = function(){o.className = ""; tv.Auto = true; tv.Start();}
		})
		tv.Start();		
	}
}