Session across new browser windows

Hi All,
I am facing an issue with HttpSession when trying to open new windows in my web application and trying to acess the session from the new windows and want your expertise in solving this problem.
Here is the scenario:
1. The web application is opened in a browser window, this creates a new session and the JSP adds some stuff to the session.
2. Down the line in the app using the menu's user invokes a JSP in a new browser window using window.open JavaScript command.
3. This JSP tries to get some information from the session (which was added by the opening JSP) and fails as it gets a new session. I know this coz i checked the session ID in both JSP (opening JSP & new JSP) and they are different.
Is there a way I can aviod this. Can the new JSP join the existing session?
Thanx a lot in advance for all your help on this.
Rgrds,
Ritin

Well cookies are enabled on the machine but I am not using anything special. I am just sending the request and using the session object made available by the JSP container ('session' variable in JSP).
What I am doing is just submitting the request in the new window without any URL encoding or anything.
BTW can you explain what you meant by URLencode. How can I do that?

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