Menu Model

[eluser]TheFuzzy0ne[/eluser]
[quote author="Think Floyd" date=""]Once I’ve worked it out for 2 levels, the other 2 will be simple[/quote]
Unfortunately this is not the case. You will then have to have a loop for each level of subcategories, and making expanding it makes it more complicated and more resource intensive.

You may wish to consider looking into MPTT (Modified Preorder Tree Traversal). You'll need to change your database layout, but the effect is that you can get everything you need in only two queries. [url="http://ellislab.com/forums/viewthread/74114/"]Here's a library for CodeIgniter[/url]