Problem with login script using codeigniter's session library

[eluser]Tomas Sundvall[/eluser]
Hello!

I have created a login-script using codeigniters session library, and it works nice. The problem is that some user's who use Internet Explorer are automaticly logged out to and fro.

Sometimes it works pretty good with IE, and sometimes they are logged out as soon as they click on a link.

I just can't see why it works perfectly for all user's except those who use IE. Does anyone know what the problem is, and why?

/Tomas