Please note that official support for this menu version has now ceased. There are still plenty of users, though, and the forum is still running. Some of our long-time users may be able to help you out.
The good news: It is possible. Two general options: (1) Generate the menus dynamically, using server-side scripting, like php. (2) Store the current user's access level locally -- e.g., in a variable within a hidden frame, in a cookie (bad if cookies are diabled), or in a parameter passed from page to page -- and use conditional tests in the menu_array.js code to generate the different menu versions at runtime.
The bad news: Either approach will require a good working knowledge of the scripting language (php or js), so you may find it a bit difficult if you're a beginning scripter.
set the user levels in the menu and/or page settings in the db (create extra fields for these)...
then, when you are looping out your data just call up an if statement...something like...
if $row_user['user234']' >= $row_menu['menu1'] then ... loop out your info...
if user is level 0 and the data is level 1...they don't get it...if they are level 1 or 2 or more though...yep, they can have it...
this is what i've done for something small...it's not sessions or cookies, but it does the trick...you can also restrict the various functions they have access to - like maybe a delete button or whatever...
good luck...jv
(i'm assuming you have some kind of login thing going on there)