I am running a RHEL 5 system. I am trying to open a recorded session. When I clicked on the URL, Firefox says "Could not find an appropriate hxplay or realplay in the system path to use as an embedded player"

The following are the steps I took before I got this error. Please help me in resolving this issue.

1) Downloaded and installed RealPlayer in /home/nivi/Desktop/RealPlayer

2) Downloaded and installed HelixPlayer

3) In /home/nivi/.mozilla/plugins directory, the following are there :
lrwxrwxrwx 1 nivi nivi 49 Jan 4 19:40 nphelix.so -> /home/nivi/Desktop/RealPlayer/mozilla/nphelix.so
lrwxrwxrwx 1 nivi nivi 50 Jan 4 19:40 nphelix.xpt -> /home/nivi/Desktop/RealPlayer/mozilla/nphelix.xpt

4) PATH variable setting is as below:
export PATH=/home/nivi/Desktop/RealPlayer:$PATH

5) aboutlugins in Firefox shows the following :
Shockwave Flash

File name: libflashplayer.so
Shockwave Flash 9.0 r115

MIME Type Description Suffixes Enabled
application/x-shockwave-flash Shockwave Flash swf Yes
application/futuresplash FutureSplash Player spl Yes
Helix DNA Plugin: RealPlayer G2 Plug-In Compatible

File name: nphelix.so
Helix DNA Plugin: RealPlayer G2 Plug-In Compatible version built with gcc 3.2.0 on Jul 18 2006

MIME Type Description Suffixes Enabled
audio/x-pn-realaudio-plugin RealPlayer Plugin Metafile rpm Yes

I would like to add that simply invoking RealPayer from /home/nivi/Desktop/RealPlayer brings up Realplayer without any issues.