loadSound problem

i have an swf which includes flv.
in order to add music to flv the following script is placed in first frame.

swf is in server and you can see it:

[COLOR=#810081]http://www.tovale.co.il/ktantanim/train3.swf[/COLOR]

when it is first played the music does not sound.
if i refresh the page it is ok and sound is heard.and from that time it is allways heard( i think maybe because it is in the cache).
how can i solve the problem?

Attach Code
my_sound= new Sound(this);my_sound.loadSound"http://www.tovale.co.il/ktantanim/Harakevet.mp3",true);

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