[SOLVED] Background image auto resizing to screen

I would like to find a way to used a fixed background image that automatically resizes to the screen (browser window).

I have tried a bunch of different css and html in different areas.

I must be missing something. I see it on other sites.

I want to put an image of something on each side of the content area (currently set at 85% screen width) that is fixed and positioned correctly regardless of browser window size.

Thanks everyone.