String.prototype.trim = function() {
  return this.replace(/^\s+|\s+$/g,"");
}



function checkForm(frm) {
  
  if (
      frm.nom.value.trim() == emptyNom
      || frm.email.value.trim() == emptyEmail
      || frm.message.value.trim() == emptyMessage
      || frm.nom.value.trim() == ''
      || frm.email.value.trim() == ''
      || frm.message.value.trim() == ''
      )
  {
    alert(pleaseAll);
    return false;
    
  } else {
  
    if(!isEmail(frm.email.value.trim())) {
      alert(pleaseEmail);
      document.getElementById('email').focus();
      return false;
    }
    
    return true;
  }
}



function isEmail(data) {
  return /^([\w]+)(\.[\w]+)*@[\w\-\.]+\.[a-zA-Z0-9]{2,}$/i.test(data);
}