I've installed this on my site and it works beautifully. Thank you!
I have a question, though.
Let's say I want to split up categories between headers (Like, Header1, Header2, Header3) and so pages on the menu bar display certain categories.

How would I go about this?
One would assume making a new SQL table linking categories to header id's but I've only just started learning PHP so I wouldn't even know how to call those.