Browser cache clearing? HELP... FMX

HI all, so lets say I am using flash just to pump sound on a html website, utilized in a separate frame. problem --> every time a user goes back to the one page or pages that the flash sound file plays on, an echo happens, as if the browser were playing the file from the cache and loading another sound swf.

How do I stop the sound from loading on top of itself?

code for sound file:

my_sound = new Sound();
my_sound.attachSound(“rotor”);
my_sound.start(0,1000);
my_sound.setVolume(50)
gotoAndStop(“stop”);

thanks\g