function setAvailabilityCriteria(shipId, guestCount, nights)
{
    if (document.getElementById('availabilityship')) {
        document.getElementById('availabilityship').value = shipId;
    }
    if (document.getElementById('availabilityguest')) {
        document.getElementById('availabilityguest').value = guestCount;
    }
    if (document.getElementById('availabilitynight')) {
        document.getElementById('availabilitynight').options[nights].selected = true;
    }
}