Relatively simple image preloader

preload.js

function preloadImages() {
	var buffer, images;

	buffer = new Image();
	images = document.getElementsByTagName('img');

	if (images.length) {
		for (var i = 0, l = images.length; i < l; i++) {
			buffer.src = images[i].src;
		}
	}
}

preloadImages();