XHTML playing WAV files?

I'm writing a game in Javascript, which uses javascript to play some sound
effects at various events. I'm now using <embed> to add the wav file to the
html, but I'd really rather validate XHTML transitional.

Over 90% of my users are browsing with IE 5/6.

How can I validate to XHTML, and create a javascript function to play wav
files?

Thanks!

Mike