function selectNewCar() {
    var selectors = $A(document.getElementsByName('selectedId'));
    var selected = selectors.find(function(button) {return button.checked;});

    if (selected) {
        $('selectedPath').value = 'new-car[@id=' + selected.value + ']';
        return true;
    } else {
        alert("select record first");
        return false;
    }
}