Apache Rewrite Rules

Hello,
I have compiled mod_rewrite and mod_proxy into my apache 1.3.x
server and are trying to rewrite any requests that come into the
server for files in my cgi-bin/ directory to another apache server
running on port 8080. I have tried these two rules but they are not
working. Can anyone tell me what is wrong with this rule?

RewriteRule ^(.*\/cgi-bin\/.*)$ http://%{HTTP_HOST}:8080$1 [P]
RewriteRule ^/cgi-bin(.*) http://www.domain.com:8080/cgi-bin$1 [R]

Thanks
MH