function Focus(control) {
  control.focus();
  control.select();
}

function IsEmailCorrect(email) {
  return email.match(/^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@([a-zA-Z0-9-]+\.)+([a-zA-Z]{2,3})$/)!=null;
}

function wyczysc(pole) {
pole.value='';
}

function NewsletterOnSubmit(form) {
  if (!IsEmailCorrect(form.mail.value)) {
    alert('Podaj poprawny adres e-mail');
    Focus(form.mail);
    return false;
  }
  return true;
}

function openW(strona,width_,height_,sc){
         new_window = window.open(strona,'strona','width='+width_+',height='+height_+',toolbars=no,resizeble="no",scrollbars='+sc);
}