ASP session

Does anyone know how to destroy an ASP session object when a user types a 
URL in the address bar to leave a site?

I already have a the site set up so the session object is destroyed when 
they click a link, but I can't figure out how to destroy it if they simply 
type a URL in the address bar, leaving the site, and then they use their 
browser back button to return to my site. They are still "logged" in. I 
tried using the HTTP Referrer method to check to see if the URL was an 
offsite link but that doesn't work for addresses typed in the address bar.

TIA


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