function showControl(controlID) {
    var aCtrl = document.getElementById(controlID);
    if (aCtrl.style.display == 'none') {
        aCtrl.style.display = '';
    } else {
        aCtrl.style.display = 'none';
    }
}
function showAndCheckControl(controlID, checkID) {
    var aCtrl = document.getElementById(controlID);
    if (aCtrl.style.display == 'none') {
        aCtrl.style.display = '';
        document.getElementById(checkID).checked = 'checked';
    } else {
        aCtrl.style.display = 'none';
        document.getElementById(checkID).checked = '';
    }
}