@media screen and (max-width: 762px){
	#header{
		background-image: url(img/small/bandeau.jpg);
		height: 91px;
		width: 100%;
	}
}

@media screen and (min-width: 762px){
	#header{
		background: url(./img/bandeau.jpg) no-repeat left;
		height: 147px;
		width: 100%;
	}
}