Configure a proxy with Scrubyt

Hi,
I am using scrubyt few days ago and I think it´s great. I’ve used it
to get some contents from several webs, but at this moment I need to
do the same tasks that I was doing but with a connection that it is
behind a proxy.
I’ve read in some pages that scrubyt supports proxy configuration, and
I tried with the following:
fetch “URL”, :proxy"PROXY:PROXY_PORT"
But I had not any good result. I couldn’t connect. What I’m doing
wrong?
Thanks a lot.

Sorry, the code that I tried is:
fetch “URL”, :proxy => “PROXY:PROXY_PORT”