var form = "";
var submitted = false;
var error = false;
var error_message = "";

function check_form(form_name) {
  if (submitted == true) {
    alert("Formulaire déjà envoyé");
    return false;
  }

  error = false;
  form = form_name;
  error_message = "Merci de remplir ou corriger les champs suivants.\n\n";

	check_input("nom",'1',"Nom \n");	
	check_input("prenom",'1',"Prénom \n");
	check_input("adresse",'1',"Adresse \n");	
	check_input("ville",'1',"Ville \n");
	check_input_codepostal("code_postal","Code postal \n");
	check_input_email("mail","Email \n");
	check_input_telephone_national("tel","Téléphone \n");
	check_select("question", "", "Catégorie de question \n");
	check_input("commentaire",'1',"Commentaire \n");

  if (error == true) {
    alert(error_message);
    return false;
  } else {
    submitted = true;
    return true;
  }
}