Pass auto_increment ID from one form to another

[grumpy]

Hello-
I hope I'm explaining myself clearly. I have a two-page form which enters data into two MySql tables. The first table's ID field is auto_increment so that the ID is generated when the first page is submitted. Once the first page's data is inserted into the first table, the user clicks on "Continue" and the second page of the form appears.
How do I pass the just generated auto_incremented ID from the first table to the second page of the form, which enters data into a second table, so that the ID relates between the two tables?
Thanks for your help.

[dagon]

page one submits to page two
page two adds to db, retrieve the id displays more form
page two submits to page three, id stored in form hidden field

[grumpy]

Page one submits its data to one table and page two submits to a second different table, so how do I get page two to do the submission for both tables, keeping the same related ID?

[dagon]

mysql_insert_id() will give you the id used