Change pagebar through CSS?

Hi all.

I’ve recently customised the Contempt theme by Michael Heilemann. It looks to be ok in the preview but I’d like to change the pagebar.jpg, bg.jpg and the appearance of the “home” and “about” buttons. Also if possible, I’d like to change the colour of the top bar called wpcombar_bkg.png. For a clearer view, please look at http://www.geocities.com/kendalbren/gaijintonicdesktop.jpg I’ve uploaded a screenshot showing the bit I’d like to change through CSS or any other way if possible.

Thanks in advance.