public void onBlockPhysics (BlockPhysicsEvent event){

		if (event.getBlock().getType() == Material.MOSSY_COBBLESTONE){

			if (event.getBlock().isBlockPowered())
				event.getBlock().setType(Material.GLOWSTONE);

		}else if (event.getBlock().getType() == Material.GLOWSTONE){

			if (!event.getBlock().isBlockPowered())
				event.getBlock().setType(Material.MOSSY_COBBLESTONE);

		}
	}