function choix(id) {
var element = document.getElementById(id);
	for (var i=1; i<=12; i++) {
		if (document.getElementById('smenu'+i)) {
			document.getElementById('smenu'+i).style.display='none';
			document.getElementById('onglet_smenu'+i).className='off';
			document.getElementById('onglet_'+id).className='on';
		}
	}
	if (element) {
		element.style.display='block';
	}
}