Viv,
Thanks for your reply. I was going to start arguing with you at first, but then I thought I would read the docs a little better myself. I should have used | instead of |=.

Einar

>Hi,
>
>>>Can this be explained?
>
>Yes. From documentation:
>
>An expression using the |= assignment operator, such as
>x |= y
>is equivalent to
>x = x | y
>
>HTH,
>Viv