How can i get the amount of online user??

when a user sign in or sign out,the amount of online user should change��
and i now use a class that implements HttpSessionAttributeListener to implements this function,has three method:
public void attributeAdded(HttpSessionBindingEvent se)
public void attributeReplaced(HttpSessionBindingEvent se)
public void attributeRemoved(HttpSessionBindingEvent se)
and by attributeAdded i can count the amount of online user correctly when a user sign in.
but when sign out,there are some troubles:
user can leave through three method 1.signout button(it is related to session.removeattribute("user")),and use attributeRemoved can count the amount of online user correctly when a user sign out.
2.close the browser directly
3.not close the browser directly but use this browser navigator to another webpage(by enter url in address toolbar)
the problem is: when user sign out through method 2 and method 3,i can't listen it
and attributeRemoved not invoked.
help!!!!!!!!!!!!!!!!!,how can solve it,thanks a lot!!!

Sooner or later server will kill session so the only way is to look at HttpSessionListener interface
Paul

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