As far as I know, there is no concept of banner in fisheye. However, fisheye provides an option to add a customised welcome message. You can put your message by navigating to administrator>Front page customisation.
If you are ok to put your message in the footer (which appears in every page of fisheye), you can edit the footer file available in <fecru-installation-directory>/content/WEB-INF/tags/cru/footer.tag
Hope that helps Habib
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