Okay ..(forgive the robotic response below it's become habit..)

Open your control panel, and click on primary settings, then scroll to style templates and click. Now open a new browser window with the same page showing. In window "A" choose your current look and style from the drop menu. In window "B" click on "Create a new Style Template".
Copy and paste all values from "A" to "B" and give "B" a new name in the text box near the top. Once you are set replace banner a, with banner b.
Submit changes by clicking the grey button. Once that is done, look for the link "» Style Settings" and click. Then look for "» Edit Template Associations " and click. Once in here you will assign your new template where it needs to be.

Make sense?

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