history.back or set a value of how many you want to go back (-2, -3), just off the top of my head. Can't remember the exact syntax..
But if you are talking about custominzing per visitor, regardless of when the return visit takes place, we are talking about cookies. Otherwise, use sessions to control that. Or is that just an ASP thing? Heh.
"Absorb what is useful, discard what is not. Add what is uniquely your own." - Bruce Lee - The Tao of Jeet Kune Do