var isIE = (document.all) ? true : false;

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

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

    var Extend = function(destination, source) {
	    for (var property in source) {
		    destination[property] = source[property];
	    }
    }

    var Bind = function(object, fun) {
	    return function() {
		    return fun.apply(object, arguments);
	    }
    }

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


    //ie only
    var RevealTrans = Class.create();
    RevealTrans.prototype = {
      initialize: function(container, options) {
	    this._img = document.createElement("img");
	    this._a = document.createElement("a");
    	
	    this._timer = null;//计时器
	    this.Index = 0;//显示索引
	    this._onIndex = -1;//当前索引
    	
	    this.SetOptions(options);
    	
	    this.Auto = !!this.options.Auto;
	    this.Pause = Math.abs(this.options.Pause);
	    this.Duration = Math.abs(this.options.Duration);
	    this.Transition = parseInt(this.options.Transition);
	    this.List = this.options.List;
	    this.onShow = this.options.onShow;
    	
	    //初始化显示区域
	    this._img.style.visibility = "hidden";//第一次变换时不显示红x图
	    this._img.style.width = this._img.style.height = "100%"; this._img.style.border = 0;
	    this._img.onmouseover = Bind(this, this.Stop);
	    this._img.onmouseout = Bind(this, this.Start);
	    isIE && (this._img.style.filter = "revealTrans()");
    	
	    this._a.target = "_blank";
    	
	    $(container).appendChild(this._a).appendChild(this._img);
      },
      //设置默认属性
      SetOptions: function(options) {
	    this.options = {//默认值
		    Auto:		true,//是否自动切换
		    Pause:		3000,//停顿时间(微妙)
		    Duration:	1,//变换持续时间(秒)
		    Transition:	23,//变换效果(23为随机)
		    List:		[],//数据集合,如果这里不设置可以用Add方法添加
		    onShow:		function(){}//变换时执行
	    };
	    Extend(this.options, options || {});
      },
      Start: function() {
	    clearTimeout(this._timer);
	    //如果没有数据就返回
	    if(!this.List.length) return;
	    //修正Index
	    if(this.Index < 0 || this.Index >= this.List.length){ this.Index = 0; }
	    //如果当前索引不是显示索引就设置显示
	    if(this._onIndex != this.Index){ this._onIndex = this.Index; this.Show(this.List[this.Index]); }
	    //如果要自动切换
	    if(this.Auto){
		    this._timer = setTimeout(Bind(this, function(){ this.Index++; this.Start(); }), this.Duration * 1000 + this.Pause);
	    }
      },
      //显示
      Show: function(list) {
	    if(isIE){
		    //设置变换参数
		    with(this._img.filters.revealTrans){
			    Transition = this.Transition; Duration = this.Duration; apply(); play();
		    }
	    }
	    this._img.style.visibility = "";
	    //设置图片属性
	    this._img.src = list.img; this._img.alt = list.text;
	    //设置链接
	    !!list["url"] ? (this._a.href = list["url"]) : this._a.removeAttribute("href");
	    //附加函数
	    this.onShow();
      },
      //添加变换对象
      Add: function(sIimg, sText, sUrl) {
	    this.List.push({ img: sIimg, text: sText, url: sUrl });
      },
      //停止
      Stop: function() {
	    clearTimeout(this._timer);
      }
    };�