function ff_acro_validation(element, message)
{
    if (!ff_getElementByName('acro').checked &&
        !ff_getElementByName('fun').checked &&
        !ff_getElementByName('boogie').checked) {
        ff_validationFocus(element.name);
        return 'Please select at least one category\n';
    } // if
    return '';
} // ff_acro_validation