Newly inserted record ID

Thanks to the help of this list, I am making great progress. Now this -- I have a multi-part submission form for a support application for us, the manufacturer - the reseller's information is submitted, the customer's information is submitted, then the warranty support information needs to be submitted. How can I retrieve the CustomerID after I insert a record into the customer table in mySQL and pass it to the CSQdetails.php page? Thanks, Jon