Session expiring issue.

Hi!

I use FCK Editor on my new website and discovered some problem with it. I need to transfer parameters to FCK (through session variables) to set a home directory for files upload. I haven't found another way to transfer them except using session (is there any other way?). But when my session is getting expired FCK doesn't redirect to login page (as it supposed to be) and all files begin to upload to some directory by default. I can't use that directory since I have to change it dinamically each time in my app. So the question is how to make FCK to redirect to login page when the session expires? Please advice, it's very urgent Thanks!