1) Project Details:
go here: http://www.galaxyscripts.com/
download the free script: Mini File Host 1.5
modify the uploader/download sections to where it will do this:
I want an in-page pop-up. a div popup for the uploaders page.
I want a delay when they press the button in 20-60 seconds to pop it up or when 20% of the files is uploaded
2) Payment Amount: $20
3) Payment method: Paypal, $10 down