function swap (img) {
	var path = img.src;
	var type = path.substring(path.lastIndexOf("."));
	var isOver = path.lastIndexOf("-over")>0;
	var name = path.substring(0, isOver ? path.lastIndexOf("-") : path.lastIndexOf(type));

	img.src = name + (isOver ? "" : "-over") + type;
}