Issue with Explorer

First time poster, long time lurker.

I am having issues with my flash site in Explorer on XP. Not sure if it is in Vista as well. In my script I load some music clips dynamically and then issue an onLoad to clear the “loading” text and activate the controls.

In Explorer when the site is visited the first time everything loads fine and is cashed. when the site is visited the second time the onLoad never gets executed so the “loading” text remains and the controls are not activated. How should I resolve this?

Works fine in FireFox and Safari.