function ff_age_validation(element, message)
{
    var age = 0;
    for (var i = 0; i < ff_elements.length; i++)
        if (ff_elements[i][2]=='age') 
            if (ff_getElementByIndex(i).checked) age++;
    if (age==0) {
        ff_validationFocus(element.name);
        return 'Please select age class\n';
    } // if
    return '';
} // ff_age_validation