Word 97 VBA - inserting text

Hi,
I have the following situation which I need assistance with:

I have an option button and if it is not selected, I want to be able to insert a blank space at a bookmark in a document (so information can be manually entered in pen at a later date - so in other words a string of blank characters). I have the following code but it is not working.

Private Sub optEmployerSpons_Empty()
If optEmployerSpons.Value = False Then
Selection.GoTo What:=wdGoToBookmark, Name:="bkDlg_MemberDOB"
Selection.InsertAfter Text:="              "
End If
End Sub

Any assitance would be appreciated.

Thank you