jQuery preload images with callback

gistfile1.js

// Pass an array of image locations, and an optional callback function
function preload_images(images, callback){
  var preloaded = 0;
  jQuery.each(images, function(index, image){
	  var image = $('<img />').attr('src', image).load(function(){
		  preloaded++;
		  if(preloaded == images.length){ callback(); }
	  });
  });
}