This event is fired whenever the player’s state changes. Possible values are unstarted (-1), ended (0), playing (1), paused (2), buffering (3), video cued (5). When the SWF is first loaded it will broadcast an unstarted (-1) event. When the video is cued and ready to play it will broadcast a video cued event (5).
Inside the onStateChange listener, you’d check to see if it’s playing (1); if so, you’d call the stopSlider() function.