Never use Microsoft software to build a website. You'll wind up with whole pages of unnecessary (and often wrong) code which may not work in anybody else's browser. Your page is at present three or four times the file-size it needs to be, 'cos of all the junk MS has dumped into it. Also, don't use RealPlayer for mp3s; it should really only be used for soundfiles in .ra format, as it's aggressively built and will interfere with all sorts of things you didn't expect it to.

Having said all that, the main reason the soundfiles won't play is as Joe said: you haven't provided a URL (address) for them. Browsers can't cope with "you know, that house with a green door -or it might be blue- perhaps, just a bit down the road from where the scrapyard used to be, only it isn't now"... you have to be very specific.

If you want a boring (but problem-solving) lecture on the subject, just let me know.