xml based navigation structure within CI

[eluser]codeamatic[/eluser]
My team has decided that since we need to identify the current links in all situations we will be storing the menu structure in an array. Despite it being redundant, unfortunately it seems the best way to achieve our goal.

To get back to my very first question, now that we have decided to store the menu in an array how should we structure the methods/functions to manipulate said array? Model or Library? Should the array be stored as a config variable?

Our client has minimal php experience so if we could get away with storing this array in a file of its own so he/she could update when necessary, that would be great.