getting preview to use existing css, js, and layout.

I'm using the divarea plugin so that the ckeditor will adapt better to styling, but when you preview it, the css and such aren't carried over.

I seen how you can add css to the preview page but not how you can add layouts and scripts.

if I could at least get scripts, I'll be fine with that at least, sure asking for a layout is probably an overreach.

Thanks