desk2web.net - affiliate system

I want to attract customers to my offsite backup service web site, and propose offering affiliation. I only want to pay for completed registrations, and only pay out after the initial 14-day trial period (this must be editable as the trial period duration may change). Payments will be made by PayPal. Full administration area is needed to track affiliate activity etc, and an affiliate area where they can choose the banner to be displayed or text links etc. The script must be easily incorporated into a Dreamweaver template. Questions/suggestions etc via the private message system please.