function ImagePreloader(images, loadingfunc, callback)
{
	// store the callback
	this.callback = callback;
	this.loadingfunc = loadingfunc;
	
	// 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++;
	this.loadingfunc(this.aImages, this.nProcessed);

	if ( this.nProcessed == this.nImages )
	{
		this.callback(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();
}