Conception problem: Integrating navigation tree

Hi all,
In order to help users to visualize what actions they can perform, i would like to add a navigation tree into an existing web app.
My first idea was to create a new Index.jsp divided into two frames, the first one get the tree and the second is used for displaying the .jspx called. Problem, in the browser address bar the only thing which is displayed is "http....index.jsp". I no longer have the adress of each page and that lead to difficulties in securizing the app, and some problems in using browser navigation capabilities.
A solution could be to just create my tree into a new page then including a button to go to this page from all the others, but my idea was to let this tree displayed everytime (or may be adding a way for switching rendered property).
A last possibility i imagined is to include the tree into each page, but before doing this (there is a lot of pages to modify) i would rather than some experimented people give me some advices:
What is the best solution?
Should i use a frame based sharing or another way?
Thanks in advance,
Tif

Hi frank,
Thank you for being interested.
This web app works like an ERP (enterprise resource planning). Around 50 persons should use it. Depending on their roles they have rights for view, create, modify data in different modules (business development, human resources, instrument maintenance, etc). Each module contains many pages (customer creation and edition, quotation management, etc).
The tree displays each module and some pages of each represented by hyperlinks. Depending on the user who is logged in the tree displays less or more possible navigations. It should enable to navigate quickly from one page to another by these links. User can choose to hide it. So if user well know the application he doesn't need really to use the tree (there is other way to navigate), but for beginners it should display in a simple way all the tasks they can perform depending on their role.
I hope this explanation is more clear. In my last tries, i'm putting it in the menu3 facet of my pages, but i've problem to target the window. When i put _parent display is correct but the browser address bar display "http...myTree.jsp" and not the called page address. I'm working on, so i very appreciate all tips, advices you can give to me
Thanks and regards,
Tif

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