I assume you mean the site-wide announcement/banner. You could try the syntax on this page listed under the Displaying an image from a remote location heading. You would need to attach the image to a page, view the image and copy the URL. You may be able to refer to the attachment ID (found in the URL), but my Confluence skills are not that advanced. Hope this helps.
Just jumping in here -- are you referring to the rotating images in the Zen Intranet demo brand? If so, then this should help: http://www.brikit.com/display/zenlightning/Making+the+Banner+Content+Your+Own
We're using the Random Content macro there, which animates content from a set of child pages. (the images go in the child pages.)
Let us know if you need more information! Hope this helps.
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