Landing Page Control external to main menu.

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I have several landing pages, all of which allow access through a menu to the main site, but are themselves not included in the menu.

What I am looking to do is, depending upon which landing page is viewed, (PPC Campaign), store those details, add them as a link to a specific image in the top of the sidebar so that they have access back to their specific landing page.

How do I do this?

:)

stephenlaw