session id is same for different Browser

[Gao, Gang]

Hi,
I have a very strange case, When I logon to my site using two different
Browser, I print out the session id and find it is same. Actully I open two
different Browsers on same machine. How does it have same session id. Please
help me out. I use struts and weblogic6.0 as web server. I put some value
object in session, it looks like the second logon overwrite the first value
object in session.
Thanks a lot.
Gang