var preloadedImages = Array();
function preload(image) {
	if (document.images) {
		preloadedImages[image] = new Image();
		preloadedImages[image].src = image;
	}
}


function changeImage(image, imageSrc) {
	preload(imageSrc);
	var element = getElement(image);
	element.src = imageSrc;
}

function getElement(element) {
	return document.getElementById(element);
}