function valider_formulaire() {
	with (document.forms['f_note']) {
		if (note5.checked == 0 && note4.checked == 0 && note3.checked == 0 && note2.checked == 0 && note1.checked == 0) {
			alert ("Veuillez choisir une note !");
      		return false;
		}

		valider.disabled = true;
		valider.value = 'Patientez...';

  		return true;
  	}
}