function enableEmissionQuestion()
{
    var input_fuel = document.getElementById('brandstof').value;

    var node = document.getElementById('emission_diesel');
    if (node) {
        if (input_fuel == 'd') {
            node.className = node.className.replace(/nodisplay/, '');
        } else if (input_fuel == 'b') {
            node.className = node.className + ' nodisplay';
        }
    }
}

function onSubmitBijtellingForm(e)
{
    // validate fields
    var requiredFields = ['co2_emission', 'privegebruik', 'belastingschijf', 'eigenbijdrage'];

    for (var i = 0; i < requiredFields.length; i++) {
        var field = document.getElementById(requiredFields[i]);
        if (field) {
            if (field.value == '') {
                alert(getText('BijtellingRequiredFieldsNotice'));
                cancelEvent(e);
                return;
            }
        }
    }
}

function initBijtellingForm()
{
    var input_fuel = document.getElementById('brandstof').value;

    var node = document.getElementById('emission_diesel');
    if (node) {
        if (input_fuel == 'd') {
            node.className = node.className.replace(/nodisplay/, '');
        } else if (input_fuel == 'b') {
            node.className = node.className + ' nodisplay';
        }
    }
}