51029 Terms Of Service - Cookie Set

THE SETUP: We have a webpage that has a google pr of 4 and lots of tasty spiderable links and text. Google and Yahoo spider this page and our site daily. We must add a splash page on our site that forces visitors to agree with our terms of service. THE GOAL: Put a Splash Page into place without actually replacing the existing [login to view URL] page, while still maintaining the [login to view URL]'s current PR and the top SE Rankings being achieved by it. The splash page only appears when a user visits www.companyname.com. It will not appear if a user visits any other internal page of the site This can probably be accomplished with either a javascript or with php. We would like a solution that allows user-agents like google to pass through so that it can easily get to our warning page without needing a cookie. This domain does have existing cookies for our forum which is built on Vbulletin. So this will need to work independently of that cookie and not interfere with it.