Toggles playback.
The togglePlay() function either pauses or plays the current video based
on its current state:
play event is fired. The
play event handlers set on the video box by the onPlay( )
function are called. (Any event handlers set in the Editor are also called.)pause event is fired. The
pause event handlers set on the video box by the onPause( )
function are called.  (Any event handlers set in the Editor are also called.)