var showAD = {
                curve: function(t, b, c, d, s) {
                    if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
                    return c / 2 * ((t -= 2) * t * t + 2) + b
                },
                fx: function(from, to, playTime, onEnd) {
                    var Me = this,
                    who = this.adWrap,
                    position = 0,
                    changeVal = to - from,
                    curve = this.curve;
                    playTime = playTime / 5;
                    who.style.overflow = 'hidden';
                    function _run() {
                        if (position++<playTime) {
                            who.style.height = Math.max(1, Math.abs(Math.ceil(curve(position, from, changeVal, playTime)))) + "px";
                            setTimeout(_run, 10)
                        } else {
                            onEnd && onEnd.call(Me, to)
                        }
                    };
                    _run()
                },
                init: function(info) {
                    var Me = this,
                    loadImg = new Image;
                    loadImg.src = info.endImgURL;
                    window.onload=function() {
                        Me.endImgURL = info.endImgURL;
                        Me.img = document.getElementById(info.imgID);
                        Me.adWrap = document.getElementById(info.adWrapID);
                        var max = Me.img.height;
                        setTimeout(function() {
                            Me.fx(max, 0, 500,
                            function(x) {
                                this.img.src = this.endImgURL;
                                this.curve = 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
                                    }
                                };
                                this.fx(0, this.img.height,90)
                            })
                        },
                        info.timeout || 2000)
                    };
                }
            };
            showAD.init({
                adWrapID: 'ad_box_2009_04',
                imgID: 'adImg',
				endImgURL: 'http://img.officedepot.com.cn/odchina/smallline.jpg'
                /*endImgURL: 'http://img.officedepot.com.cn/odchina/smallnotice.jpg'*/
            });