Thread:Extension talk:CategoryTree/memorize opened in tree categories

It became necessary to store(or memorize?) opened in tree categories and after move to another page we should open those categories. Other words - we are opening several categories in the tree, then we click several times at various articles and we should see the tree in the same form (those several categories should be still opened).

What the easiest way to do it? Big thx for help!

PS: sorry for my pure english