//=============================================================================
// Image Preloader
function ImagePreloader(images, callback)
{
   // store the callback
   this.callback = callback;

   // 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;
   //oImage.source = images;
   
   // assign the .src property of the Image object
   oImage.src = image;
}
ImagePreloader.prototype.onComplete = function()
{
   this.nProcessed++;
   if ( this.nProcessed == this.nImages )
   {
      this.callback(this.aImages);
   }
}
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();
}


/*
	EXAMPLE USAGE

var images = [
	'image1.jpg',
	'image2.jpg',
	'image3.jpg'
];


function done () {
	alert('images loaded');
}


new ImagePreloader(images, done);

*/