Usemap, Playsound and page reloading?

I sometimes use clickable images in my posts, with audio clips playing when points on the image are clicked. But one commenter has the problem that when they click, they’re taken back to the top of the post. (I seem to remember that something like this happened to me when I previewed the post while writing it, but the issue has vanished for me.)

There are two clickable images near the bottom of this post:
http://www.englishspeechservices.com/blog/?p=5359

All suggestions gratefully received. And sorry if this is not the right part of the forum.