using PHP on forms submitted to other sites - HELP

We have a client that has a form that submits to a payment processor to handle the cc processing. The visitor gets what he wants and then comes to a verification page on our clients site. He wants to buy it so he clicks the submit button and hes gone, to the payment processors site. We want to send a notification that someone has placed an order, not that they got to the payment page. So I have tried using onSubmit on the form and then placing the function name in there, but that doesnt work, its a function written in PHP to send a mail alert. Any thoughts we dont want the alert going to the guy until the visitor actually hits the submit button, and once it leaves the return notification from the processor is very limited, so I can't send it on the return from teh processor. Help please :) ===== -------------------------------------------------------- "Theres no such thing as a problem unless the servers are on fire!" __________________________________________________ Do You Yahoo!? HotJobs - Search Thousands of New Jobs http://www.hotjobs.com