Well, you need a plugin that would calculate a random banner name, then you could replace "ban" in the image names with a template variable. I'm not sure about the "ban_02" part in the CSS. Having that be a variable probably won't work if you have "Store CSS Stylesheets as Files" set to yes. But I guess if that turns out to be a problem you can always put that in a style attribute in the header template.
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