What about using MS Windows Media instead?
Audio Quality is far better than the RealAudio version that is used on this website, and almost every computer with Windows has it.
And Microsoft has free downloads on their website for Mac OS and Windows 95 ->
The best part is that they automatically download and install the proper Windows Media codec on the system if it hasn't got it from before.
At my web I use both this, and RealAudio8 (the last and the definately best version).