var $ = 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(phototop, slider, parameter, count, options) {
			if(parameter <= 0 || count <= 0) return;
			var oPhototop = $(phototop), oSlider = $(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;
			
			oPhototop.style.overflow = "hidden";
			oPhototop.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:			true,//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:		10000,//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";
		  }
		};
		
		window.onload=function(){
			function Each(list, fun){
				for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
			};
			
			var objs = $("idNum").getElementsByTagName("li");
			
			var tv = new TransformView("idTransformView", "idSlider", 272, 4, {
				onStart : function(){ Each(objs, function(o, i){ o.className = tv.Index == i ? "on" : ""; }) }//按钮样式
			});
			
			tv.Start();
			
			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();
				}
			})
		}