A "session" is the sequence of pages that a given user visits during a browser session. I'm interested in looking at the paths people take through the site, so that I can answer some basic usability questions based on what percentage of users do certain things. Since a "browser session" is hard to quantify, I've arbitrarily decided that a new session starts when N minutes have elapsed since the last page fetch.

Much of the site is static, leaving no easy way to track a session id. And the site is hosted, cutting off the opportunity of doing nifty things with Apache. I have to rely on server logs.