Object Sound and getBytesLoaded with IE

Hi,

I'va a little problem with the Sound Object when I use the method getBytesLoaded and see the result on IE.
I make a mp3 player with a progress bar, it works good with FireFox online and in local, with IE it wworks good in local only, online not. After several test, I undestand the error come from the method getBytesLoaded tha return 0 with IE online.
I can't understand and I can't find solution.
If a person can help me, i'm aware ;-)

Thx