[Catalyst] Session Problem with IE

[wp]

hello everyone, i'm new from china, i must say this mail-list helped me
a lot.

I have a problem in using Session in catalyst;

I use plugins as follows:
Session
Session::Store::FastMmap
Session::State::Cookie

This problem happens when i call "delete_session" method in
"logout"(this is my own action).

When I test with firefox, there is no problem.

but when i test the website in IE, after "logout", session is deleted on
the server side, but the cookie on the client is still exist. So I can
not login again.

How can I expire the cookie on the IE client? Is the delete_session
method right?