function initialisePhotoGallery() {
	for (var imageName in photoGalleryImages) {
		var preloadedImage = new Image();
		preloadedImage.src = "media/images/photo-gallery/" + imageName + ".jpg";
	}
}


function rolloverPhotoGalleryImage() {
	bottomLayer.style.backgroundImage = "url(media/images/photo-gallery/" + photoGalleryImages[currentBottomLayerImage] + ".jpg)";
	setElementOpacity('photoGalleryBottomLayer', 100);
	topLayer.style.backgroundImage = "url(media/images/photo-gallery/" + photoGalleryImages[currentTopLayerImage] + ".jpg)";
	setElementOpacity('photoGalleryTopLayer', 0);
	fadeElement("photoGalleryTopLayer", 0, 100, 0, 7, 60);
	currentBottomLayerImage++;
	currentTopLayerImage++;
	if (currentBottomLayerImage >= imageCount) {
		currentBottomLayerImage = 0;
	} else if (currentTopLayerImage >= imageCount) {
		currentTopLayerImage = 0;
	}
}