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If you don't need it to change, why use the banner code atall? Just hard code it into your theme.
The file you will need to change depends on the theme you are using, but usually can be found in:
/themes/(yourthemename)/xotpl/xoheader.html
But as I say, some themes are different... if you can give us a link to the theme or your site, we might be able to help better.
Never let a man who does not believe something can be done, talk to a man that is doing it.