function majeur(){
	var box = document.getElementById('18ans');
	var prix = document.getElementById('prix');
	var transmettre = document.getElementById('submit');
	var div1 = document.getElementById('pas_valide1');
	var div2 = document.getElementById('pas_valide2');
	
	if (box.checked == true) {
		prix.disabled = false;
		transmettre.disabled = false;
		div1.className = "visible";
		div2.className = "visible";
	}else if (box.checked == false) {
		prix.disabled = true;
		transmettre.disabled = true;
		div1.className = "invisible";
		div2.className = "invisible";
	}
}