Seperating data from form into two tables

I'm pretty new to PHP and i'm hoping someone can help me out. I've looked through a couple of books and haven't been able to find out how to take data from a form and insert it into two tables. For example, I have a client and an interests table and data comes from the same form. I've been working on this on/off for a day and haven't been able to figure out how it works. My question is: 1. Do I need to open two database connections (one for inserting clients and one for inserting data into interests) 2. Is it recommended that I do this insert with two functions or does it matter? I'm hoping someone can help me out. I've posted my PHP script at www.ucalgary.ca/~myuen/phpscript.html. Thanks in advance, Mike