CodeIgniter 3.0 User Guide

This menu button might have a problem

Part I
I visit http://www.codeigniter.com/userguide3, do nothing.
I visit http://www.codeigniter.com/userguide3/ov...index.html, click the button and go to old style.
I visit http://www.codeigniter.com/userguide3/tu...index.html, it appears as the new style.

Part II
I visit http://www.codeigniter.com/userguide3, click the button and go to old style.
I visit http://www.codeigniter.com/userguide3/ov...index.html, it's old style. I click the button and go to new style.
I visit http://www.codeigniter.com/userguide3/tu...index.html, it still appears as the old style.

Maybe caused by cookie path?

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