JQuery :: Keeping Full Width Slideshow Centered On Window Resize

I have a site that I'm building at [URL] which use the jquery cycle plugin for a slideshow. I won't post the code here because it's all there with view source at the above address. It's a work in progress. The slideshow is full width (the images in it are actually 2000px wide but looks full width), and works fine apart from when the browser window is resized. This is most noticable when you start with a smaller browser window and then resize it to be bigger.

The slides stay the same width as when the page loaded - I need them to adapt to the new width. I need the slideshow to be centered at all widths, so I've put the images in as backgrounds to divs with center positioning on them. I've tried getting the window width on resize and then applying it to the slides using jQuery, but the original calculated size overrides it when the slide changes.