multiple menus (wp_nav_menu)

Hi guys,

I have my main navigation which has a selection of sub pages and stuff.

I have a secondary navigation which I want to display depending on which page you are on.

The idea is that I have created say, five different wp_nav_menu’s and if page X is the current page, I want menu x to show in the sidebar.

Hope this makes sense, can anyone point me in the right direction?

Creating the menu isn’t a problem, and it looks like there is a conditional statement at the bottom of http://codex.wordpress.org/Function_Reference/wp_nav_menu which I can “butcher” to my needs!

My question is:

How do I only show the top level nav on all pages, and then show the sub nav’s or the custom wp_nav_menu’s on the pages I choose, as well as having one generic one for all other pages?