IsPlaying method invoke

Check the standalone player to see if it's playing.

Parameters:

	npobj	the NPObject to act on
	name	ignored for this method
	args	ignored for this method
	argCount	the count of arguments, always 0
	result	a boolean fron the standalone player

    <invoke name="IsPlaying" returntype="xml">
         <arguments></arguments>
    </invoke>
    

method invoke