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 formularz_sprawdz(form)
{
if (!IsEmailCorrect(form.email.value)) {
    alert('Proszę podać poprawny adres e-mail');
    Focus(form.email);
    return false;
  }
return true;
}

function rozwin(pole)
{
	ul = document.getElementById("ul" + pole);
	if (ul.style.display=='none')
		ul.style.display='block';
		else
		ul.style.display='none';
}

function zamknij_popup() {
	okno = document.getElementById("popup");
	okno.style.display='none';
}