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.src = "javascript:void(0);"; //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, function() { this.Stop(); });
                this._img.onmouseout = Bind(this, function() { 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: 2000, //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();
                    }
                }


                //设置图片属性
                //设置图片属性
                this._img.src = list.img; this._img.alt = list.text; 
                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);
            }
        };