Ask HN: How to run arc web app in the background?

I download the web app from http://ycombinator.com/arc/arc3.1.tar, and deploy it. ssh to my host, then :

mzscheme -f as.scm

(load "news.arc")

(thread (nsv))

But when i exit from ssh, the server "nsv" is down. so i can't back to the prompt.

I try this: "mzscheme -m -f as.scm < news.arc &", but i got errors like "Error: "Bad object in expression #<eof>"

How shoud i do?