// copyright lexilogos.com
function racine() { 
rac = Math.sqrt(document.calculator.resultat.value);
  document.calculator.resultat.value = rac;
}
function calculer() { 
car = document.calculator.saisie.value;
car = car.replace(/,/g, "\.");
car = car.replace(/x/g, "\*");
car = car.replace(/X/g, "\*");
car = car.replace(/:/g, "\/");
car = car.replace(/;/g, "\.");
car = car.replace(/\?/g, "\.");
car = car.replace(/ /g, "");
  document.calculator.saisie.value = car;
  nbre = eval(car);
  document.calculator.resultat.value = nbre;
  document.calculator.saisie.focus();
}
function alpha(val) {
    document.calculator.saisie.value = document.calculator.saisie.value + val;
    document.calculator.saisie.focus();
}