Hi Lou.
Typically you will have a field(s) in your form which will contain these addresses.
You just concatenate them together like it should look in a normal email. make sure you remember the semi colons. concat("[email protected]; [email protected]) or concat(ccfield1, "; ", ccfield2)
Hope that helps.
If you would like to see an Active Directory web service where you could look up user's email addresses directly let me know.