function ImagePreloader(images, onPreload){

   // store the call-back
   //this.call-back = onPreload;

   // initialize internal state.
   this.nLoaded = 0;
   this.nProcessed = 0;
   this.aImages = new Array;

   // record the number of images.
   this.nImages = images.length;

   // for each image, call preload()
   for ( var i = 0; i < images.length; i++ )
	  this.preload(images[i]);
}
	
ImagePreloader.prototype.preload = function(image){

	// create new Image object and add to array
	var oImage = new Image;
	this.aImages.push(oImage);

	// set up event handlers for the Image object
	oImage.onload = ImagePreloader.prototype.onload;
	oImage.onerror = ImagePreloader.prototype.onerror;
	oImage.onabort = ImagePreloader.prototype.onabort;

	// assign pointer back to this.
	oImage.oImagePreloader = this;
	oImage.bLoaded = false;

	// assign the .src property of the Image object
	oImage.src = image;
}

ImagePreloader.prototype.onComplete = function(){

	this.nProcessed++;
	if ( this.nProcessed == this.nImages ){
		this.call-back(this.aImages, this.nLoaded);
	}
}

ImagePreloader.prototype.onload = function(){

   this.bLoaded = true;
   this.oImagePreloader.nLoaded++;
   this.oImagePreloader.onComplete();
}

ImagePreloader.prototype.onerror = function(){

   this.bError = true;
   this.oImagePreloader.onComplete();
}

ImagePreloader.prototype.onabort = function(){

   this.bAbort = true;
   this.oImagePreloader.onComplete();
}