Dynamic Bookmark

hey guys, I am trying to see reports from many pages in a single page and I am using bookmarks for that. 

This is my page navigation expanded bookmark where i have buttons to  around different pages.. 

Now, If i select page 2 on the page navigation menu -

 I get my report on Page2 where i have tables and all. 

But now when i click on my Collapse button (which should collapse the expanded page navigation menu and also have the selected page) 

I am able to hide the Page Navigation menu but I am not able to retain the selected page which is page 2 and not page 1. so, how should I add the selected page dynamically to my bookmark? please help.