Coding help

I have a website that has multiple landing pages. Each landing page links to the home site. I need to make the home button of the one home page dynamic to return to the original referring landing page. In other words, the home button of that one home site will link back to what ever landing page that it came from. Basically it would disable the home sites normal home page and use the referring landing page as the new home page. We are also using Google analytics and want to make sure the links can be followed to track. Thanks