function validation_nl()
{
  var email = document.nl.fromnews.value;
  if (email.search(/^[_a-z0-9-]+(.[_a-z0-9-]+)*[^._-]@[a-z0-9-]+(.[a-z0-9]{2,4})*$/) == -1)
  {
    alert ("entrez une adresse Email valide ("+email+")");
    return false;
  }
  else
  {
    return true;
  }
}