An explanation about the "autologin" of this script when you add an account is still welcome.

It's also seem the script don't work on iGoogle for me. I correctly have the menu to change of user but if I do, I only have a refresh and I'm still connected with the same user.

What is exactly the "autologin" of this script when you add an account? I can't see any difference when I add an account with autologin turned on and another one with autologin turned off.