Well, I just showed that code as a sample that I use EMPTY() function in order to check the value and do not depend on the type of value, that's all.
>Nick,
>
>But that makes all your IFs inverted logic
>
>

>if ( empty( this.Value ) )
>   * false value/unchecked  code
>else
>   * true value/checked code
>endif
>

>
>as a personal choice I think this is clearer:
>
>

>if ( this.Value )
>   * true value/checked code
>else
>   * false value/unchecked  code
>endif
>

>
>plus it avoids the expense of a function call.
>
>>FWIW, I always check my checkboxes values in code with IF EMPTY(mycheckbox.value), so it does not matter at all what whether it is logical or numeric. (BTW, I do not use NULL values for checkboxes - never had to.)