junction tables: how to insert data

I've a many to many relation using a junction table.
I have 3 tables: questionaire, questions and a junction table; i want to add
a row to the first table(questionaire name), some record in questions table
and the record to make the junction on the junction table. i have to do this
without using user interface, only programming(the data are in variables). I
can add the row on the first table but i don't know the record "Id" because
the "Id" field is Auto-increment so i don't know what value to insert in the
junction table as Questionaire id. the same problem is the one i find for
questions table and junction table. Do you have some solution?
Sorry for bad english(i'm italian)
.

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