Apache ProxyPass

Hi there.

I would like to know if is it possible to do something like this :

- i have the opmanager running in port , let's say , 9090
- i have a web server (apache) running in the same host , listening in port 80

- i would like to have a url like http://server:80/opmanager , instead of having
http://server:9090

I believe that this could be accomplished using proxypass in the Apache, but so far i could't have working.
Can someone point me out some tips?

Thanks,
Bruno