void scrollImage() {
		// Scroll the image up by 8 pixels.  Really slow.
		for (int y = 0; y < IMAGE_HEIGHT - 8; y++) {
			for (int x = 0; x < IMAGE_WIDTH; x++) {
				imageData[y * IMAGE_WIDTH + x] = imageData[(y + 8) * IMAGE_WIDTH + x];
			}
		}
	}