section.banner {
	height: auto;
	margin: 0 auto;
	padding: 10px 0;
	position: relative;
	width: 1140px;
	z-index: 0;
}
section.banner img {
	height: auto;
	width: 100%;
}
#imgBig {
	display: block;
}
#imgMedium, 
#imgSmall {
	display: none;
}
@media screen and (max-width: 1140px) {
	section.banner {
		width: 100%;
	}
}
@media screen and (max-width: 860px) {
	#imgBig {
		display: none;
	}
	#imgMedium {
		display: block;
	}
}
@media screen and (max-width: 450px) {
	#imgMedium {
		display: none;
	}
	#imgSmall {
		display: block;
	}
}