function switchToMobileDisplay() {
	deleteBlocById('leftnav');
	switchCSSToMobile();
}

function deleteBlocById(id) {
	var div = document.getElementById(id);
	div.parentNode.removeChild(div);
}

function widthDetection() {
	larg = screen.width;
	return larg;
}

function display_adaptation() {
	if (widthDetection() < 400) {
		switchToMobileDisplay();
	}
}

function switchCSSToMobile() {
	var css = document.getElementById('csss');
	css.href = '/css/main_mobile.css';
	var titre = document.getElementById('titreImg');
	titre.src = '/images/titre_mobile.png'
}

function switchCSSToPc() {
	var css = document.getElementById('csss');
	css.href = 'css/main.css';
}