Stay logged in, or not !

[eluser]dorwin[/eluser]
Hello,

I am developping a website with member page, so there is authentification, etc.. Session variables are managed by Ci_session, so sessions are reloaded even I leave navigator.

I would like to put a checkbox with option : "Stay logged in", or not ! If not, session must be destroy when I leave nav but I don't really know how to do that, cause Ci_session are too automatically managed...

I don't know if I'm clear ><,

thanks !