slider fires 'beforeunload' event?

Hi,
I'm having an issue with the slider control, whenever the slider is
interacted with and the change event is fired, jquery is also firing
the window event 'beforeunload'.
I'm using the slider as a volume control for the windows media player
plugin, and in IE6 this causes the player to stop the current track.
Is this a known issue? Any possible fix?
Thanks