How to keep old session id when a new session is created in web site

Hi,
I have a question about HttpSession in a Struts framework based project development.
I have a web page "a.jsp" in public site (no need login) which can navigate to other pages/links. There is a button on "a.jsp" to popup a new window "pop.jsp" and create a session (session1). Usually, when I navigate to other pages/links from "a.jsp", it doesn't affect this "pop.jsp" and its session1. However, if I try to goto a secure site - a login page "login.jsp" from "a.jsp", since the "login.jsp" needs to kill current session before the login, the current session1 within the "pop.jsp" is killed at that time. When I go back to "pop.jsp", it will create a new session2 and the original session1 attributes does not exist any more. Therefore, I need to save the session1 id in somewhere to compare it with new session2 id when session is changed, and display some message in "pop.jsp".
Do anyone know how/where to keep session1 id? Any sample/suggestion would be appreciated.
Hanna

check reply 2 of [http://forum.java.sun.com/thread.jspa?threadID=5279453&tstart=0|http://forum.java.sun.com/thread.jspa?threadID=5279453&tstart=0]
like that you can comapre

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