MS Access Programming Forms

Hi,

I know that this is simple but I can't crack it, it's late on Saturday and this is due on Sunday!

I do some programming in VBA with Excel but a client has asked me to do a database. Most of it is pretty simple but I am stuck in one area. the client wants the contents of the drop downs to change in the forms depending on what is slected in other drop downs.

Now for most of the forms this is fine - I can alter the table source for teh drop downs on prior control change using VBA.

But there is one table coming in from an outside datasource. I need to pick up columns from this table in a form and -for example - if the client selects a last name I want to show all the first names that may match that last name. My plan was to feed the drop down from a query that was parameterised on the 1st drop down. Nut I can't find the right VBA code to make it work.

I know it's simple but does anyone have a simple answer?

Thanks!