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()
	 sc:include/graphics/sprite.h