@media screen, projection, handheld {
	header { height: 15em; }
	@media (max-width: 400px) {
		header {
			background-image: url(header400.jpg);
			background-size: cover;
		}
	}
	@media (min-width: 400px) and (max-width: 800px){
		header {
			background-image: url(header800.jpg);
			background-size: cover;
		}
	}
	@media (min-width: 800px){
		header {
			background-image: url(header.jpg);
			background-size: cover;
		}
	}
}