rebroadcast a live rtmp stream to ustream, jtv, freedocast,

i need someone to show me how to rebroadcast an rtmp stream that already exists to jtv or ustream, or some other streaming site like that. here is an example rtmp stream: rtmp://[login to view URL] i need to be able to broadcast an rtmp stream like that into sites like jtv and ustream. i don't know how this would be done, if you would need to create a virtual webcam that takes rtmp streams, i'm not sure. the winning bidder will be the one who can do the job for the cheapest price.