function carRentType(rent_type)
{
	if (rent_type == 'with')
	{
		var period_act = document.getElementById('period_with');
		var period_pas = document.getElementById('period_without');
	}
	else if (rent_type == 'without')
	{
		var period_act = document.getElementById('period_without');
		var period_pas = document.getElementById('period_with');
	}
	period_act.style.display = '';
	period_act.removeAttribute('disabled');
	period_pas.style.display = 'none';
	period_pas.setAttribute('disabled', 'disabled');
}