Issues with scrolling background

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so i'm trying make simple flash game... similar old style side scrolling shooter. background scrolling itself.

what have tried till having 2 copies of symbol within movie clip. 1 starts @ coordinates 0,0, other @ 800,0 (being 800x600 stage). tween them across until first off screen , second @ 0,0. looping in background.

the problem is, seems when export swf , view on webpage, background targets getting jumpy/laggy. because using jpeg image create symbols from? should use else? there better way have scrolling background? thanks.



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