var messageNotFilledIn            = 'Not filled in';
    var messageInvalid                = 'Invalid';
    var messagePhotoSize            = 'Photo size';
    var messageMustBeBetween        = 'must be between';
    
    function checkFields_(f)
    {
        if (!checkFields(f))
            return false;
        else
            if (f.words.value.length<3)
            {
                alert('Please enter a key word more than two characters long.');
                return false;
            }
        return true;
    }