/** Listens to the check boxes. */
public void itemStateChanged(ItemEvent e) {
    int index = 0;
    char c = '-';
    Object source = e.getItemSelectable();

    if (source == squery.first("#chin")) {
        index = 0;
        c = 'c';
    } else if (source == squery.first("#glass")) {
        index = 1;
        c = 'g';
    }

    // etc