how to clone a sprite

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.
是这样的,我想做一个循环的背景,类似太空射击游戏那种的背景星空。但是我不确定舞台和我的素材哪个更大,所以最好的办法是填充尽可能多的素材。我能想到的办法就是外边传入一些用于循环创建SPRITE用的地址数组,然后不断调SPRITE的CREATE方法。这样应该能实现。不过我倒是想了解一下能不能直接通过SPRITE去克隆呢?
thanks,xiexie