Audio sync problem

i am trying to sync an audio clip with a simple flash animation. it works fine in flash, and even exported to swf file it works. however, when this file is placed into a html window, the graphics slow down. they are not complicated graphics, therefore it is not this causing the sync failure.

i am using
_root.mySound = new Sound();
_root.mySound.loadSound(“intro.mp3”, false);
to load the sound.

the file is up on www.matthewwatson.co.uk/clients/ghokungfu (ignore rest of site, its pretty **** so far!)

any help would be very much appriciated.

cheers for any reply

sifu