... 
AnimatedImageRotator.AnimatedImageRotatorBehavior = function(element) { 
...this._fadeAnimation = null;
this._timer = null; 
this._onImageLoadHandler = null; 
} 
AnimatedImageRotator.AnimatedImageRotatorBehavior.prototype = { initialize : function() { ... 
if(this._fadeAnimation == null){this._fadeAnimation = 
new AjaxControlToolkit.Animation.FadeAnimation( element, this._rotationInterval/20, 150, AjaxControlToolkit.Animation.FadeEffect.FadeIn, 0, 1, true); 
}if (element) {
this._onImageLoadHandler = Function.createDelegate(this,this._onImageLoad);$addHandler(element, 'load', this._onImageLoadHandler);}
...},
dispose : function() {...var element = this.get_element();
if (element) {if (this._onImageLoadHandler) {$removeHandler(element, 'load',this._onImageLoadHandler);this._onImageLoadHandler = null;}}
... 
if (this._fadeAnimation) 
{this._fadeAnimation.dispose();this._fadeAnimation = null;
} 
... 
}, 
_onImageLoad: function(){ if(this._fadeAnimation) this._fadeAnimation.play(); }, 
... } ...