A couple of steps:
1. Create the list box to display both fields, SalutID and Salutation.
2. Use a query to populate the listbox by setting the RowSourceProperty.
3. Set the column width for the SalutID portion to 0, making that data invisible.
4. Set the BoundColumn to the column that contains the SalutID.
5. Set the Control Source to the Field in the table.
I think this should do it...