function valider_form_rub(n){
  var test_form=true;
  var message_form="";
  $('alert_form').setStyles('visibility: hidden;');
  //if($('rub_f').getValue()=="0") {
  //test_form=false;
  //}      
  if(test_form==false) {
  $('alert_form').setHTML(n);
  var instance = new Fx.Styles($('alert_form'), {duration: 200});
  instance.custom({'opacity': [0,1]});
  return false;
  }
  else {
  return true;
  }
}

function valider_form_tag(n){
  var test_form=true;
  var message_form="";
  $('alert_form').setStyles('visibility: hidden;');
  if($('tag').getValue()=="") {
  test_form=false;
  }      
  if(test_form==false) {
  $('alert_form').setHTML(n);
  var instance = new Fx.Styles($('alert_form'), {duration: 200});
  instance.custom({'opacity': [0,1]});
  return false;
  }
  else {
  return true;
  }
}