I have a form that collects client\'s info and then it
If you have control over the raf-submitted.php page what I'd suggest is that you have an onclick action for the form which (after local validation) uses jQuery.ajax to call your page providing the field values as parameters in the query string (if using GET) then simply allow the submit process to continue passing the data to SalesForce.
If however you need to make the Salesforce activity invisible then you could call them the same way using type=POST and hand off to your form after that completes