Re: Have a fixed graphic on top of every page.
the file to edit is templates/tiki-top_bar.tpl or, if it exists, templates/styles/moreneat/tiki-top_bar.tpl (moreneat is an example, replace it with the theme you use). tpl files are smarty files, that are just html files enhanced with some more stuff. copy-paste that html can be enough.
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<img src="band.jpg" width="600" heigth="50" /><img src="repeat.jpg" width="50" heigth="50" />