session id problem

Hi,

I'm writing a servlet which maintains accounts. So you can log in with username passwd. It is based on the HttpSessionid. So as long as the session is open the user has the same session id. I also have applets that checks if the user is logged in. And here comes the problem... When I post a request from an applet to the servlet with Netscape I'm not getting the same session id. Why?? With explorer works fine but I think hetscape is generating a new session id. Has someone had similar problems??
Or what is the good way to manage user sessions?? The session Id looked promising but now I'm lost.. Could someone help me out??
I'm using ObjectInputStream and ObjectOutputStream to communicate between applet and servlet.. And this seems to be not working.
THX,
Kapi