js numbers to letters in french

  var listeVals        = [1000000000, 1000000, 1000, 100, 80, 80, 60, 50, 40, 30, 20, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
  var listeStrings     = ["milliard", "million", "mille", "cent", "quatre-vingts", "quatre-vingt ", "soixante", "cinquante", "quarante", "trente", "vingt", "seize", "quinze", "quatorze", "treize", "douze", "onze", "dix", "neuf", "huit", "sept", "six", "cinq", "quatre", "trois", "deux", "un"]
  var compteQte       = [1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
  var plurAndUnit     = [1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
  var exactRequis     = [0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
  var requiertTiretEt = [0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
  var requiertTiretEt = [0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
  var offreTiretEt    = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1];

  var mettreTiret         = false;
  var precRequiertTiret   = false;
  var precRequiertTiretEt = false;

function number2Letters(number){
  mettreTiret = false;
  precRequiertTiret = false;
  precRequiertTiretEt = false;

  var res = "";
  var nb = number;
  for(var i=0;i<27;i++){
    var val = listeVals[i];
    if((exactRequis[i]==1 && nb ==val) || (nb >= val && exactRequis[i]==0)){
      if(mettreTiret) res += '-';

      if(Math.floor(nb/val) > 1)
        res += number2Letters(Math.floor(nb/val));
      else if(Math.floor(nb/val) == 1 && plurAndUnit[i]==1){
        res += number2Letters(1);
        mettreTiret = false;
      }

      if(precRequiertTiretEt && offreTiretEt[i]==1)
        res += '-et-';
      else if(precRequiertTiret && plurAndUnit[i]!=1)
        res += '-';
      else
        res += ' ';

      res += listeStrings[i];

      precRequiertTiretEt = precRequiertTiretEt[i]==1;
      precRequiertTiret   = plurAndUnit[i]!=1;

      nb = nb % val;
    }

  }

  return res;
}