playing real-stream on firefox/mozilla

Hi,

I have been trying for more than 2 weeks to install the real plugin on
mozilla/firefox.I have downloaded the Realplayer 10 for linux.then i
installed it and provided symbolic links to the nphelix.so and
nphelix.xpt in the /usr/local/mozilla/plugins and
/usr/local/mozilla/components respectively.Then,I checked the mozilla
browser plugins..I found that the realplayer plugin is present.

audio/x-pn-realaudio-plugin RealPlayer Plugin Metafile rpm Yes

but,when I open some realmedia..online.it wont play it...where am I
going wrong?How can I install real player on linux?please help me out.

Thanks.