Patterned bgs and drop shadows...possible?

I seem to remember seeing this on a website somewhere. I’m building a flash/html site that I would like to have scale vertically to fit content, thus using a repeating pattern in columns on either side of my content. I also want a repeating pattern in the background of the webpage. Since the drop shadow on either side of my content will fall ontop of the same pattern that will be in the background of the webpage, I’m thinking it will be impossible to match the patterns correctly.

Here’s an example of what i want:

btw, I want the content centered in the browser, which is worth mentioning as this wouldn’t be a problem otherwise.