function appear(){
  if(document.getElementById('provenance2').checked==true){
      document.getElementById('nom_ville_agence_voyage').style.display=("block");
  }else{
     document.getElementById('nom_ville_agence_voyage').style.display=("none");
  }
}
function appear2(){
  if(document.getElementById('provenance5').checked==true){
      document.getElementById('nom_autre').style.display=("block");
  }else{
     document.getElementById('nom_autre').style.display=("none");
  }
}
$(document).ready(function(){
    $('#depart').datepicker({dateFormat: 'dd/mm/yy'},$.datepicker.regional['fr'] );
});
$(document).ready(function(){
    $('#date_arrive').datepicker({dateFormat: 'dd/mm/yy'},$.datepicker.regional['fr'] );
});