// JavaScript Document
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 / 10;
		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,600)
        	})
		},
    		info.timeout || 5000)
        };
	}
};