insert record AND post form

Hi,
I'm sure this is a common problem, I could not find anything relating to it in search here so...

I have a form, which I insert data into database, fine.

I then want to post the same form to paypal payment page.

I've got paypal set-up fine with hidden fields in the form etc. However, how can I make the insert into database and then post the form to paypal ? should I use onClick event to trigger insert and action to post to paypal ?

using asp vb

Any advise appreciated.