#sound {
	background-image:url(../images/sound_1920.jpg); 
	height:800px;
}

@media screen and (max-width: 1366px) {
	#sound {
		background-image:url(../images/sound_1366.jpg); 
		height:650px;
	}	
}
@media screen and (max-width: 1024px) {
	#sound {
		background-image:url(../images/sound_1024.jpg); 
		height:500px;
	}
}
@media screen and (max-width: 640px) {
	#sound {
		background-image:url(../images/sound_640.jpg); 
		height:450px;
	}
}