how to clone a sprite

how to clone a sprite
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hey guys,
i am newbie for cocos2dx,and i am try to make a loop scroll ParallaxNode.and the problem is i don’t know the bg sprite is bigger or not than the screen size,so the better solution is auto create the sprite more enough,so here is my question,how to clone sprite,so that i can place them on one parallaxnode.and loop scroll on.
well,so far i can think out is just set the img url,so that i can re-create sprite base that url.thinks it can work.but copy sprite is a new question i just curious about that.