Hi Bob

You should address the range in Frank's solution via its worksheet,
in case the workbook is ever saved with a different worksheet active,
that is
Good point, I was just a little bit lazy on this part, thanks for
adding this :-)

Also, I don't know what the Data - Mask that Frank refers to is,
might be a 2003 feature or some odd German function <vbg,
O.K.You've got me - I stumbled on the translation :-)
Change 'Mask' to 'Form'. I agree with Bob's suggestion to use John
Walkenbach's add-in.

Best regards
Frank