NAME
       ChangeExtSpriteA -- Change the sprite image pointer. (V39)

   SYNOPSIS
       ChangeExtSpriteA( vp, oldsprite, newsprite, tags)
                     	  a0  a1   	 a2	    a3

	success=ChangeExtSpriteA(struct ViewPort *, struct ExtSprite *,
			struct ExtSprite *, struct TagList *);

	success=ChangeExtSprite(vp,old_sp,new_sp,tag,....);

   FUNCTION 
	Attempt to change which sprite is displayed for a given
	sprite engine.

   INPUTS
       vp - pointer to ViewPort structure that this sprite is
		  relative to,  or 0 if relative only top of View
	oldsprite - pointer the old ExtSprite structure
	newsprite - pointer to the new ExtSprite structure.

   RESULTS 
 	success - 0 if there was an error.
   BUGS 

   SEE ALSO
	FreeSprite() ChangeSprite() MoveSprite() AllocSpriteDataA()
	graphics/sprite.h

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