Creating a dynamic drop down menu

One thing to keep in mind is that if your client creates many top tier pages that exceeds the width of the top tier navigation, then some of the top tier navigation may begin to re-flow below the other navigations for a two level top tier navigation. That's why I create a single instance per category and use the <?php break;?> thereby preventing the client from breaking their navigation.

There's certainly other ways to prevent the client from creating too many top tiers, so the navigation doesn't flow to a second row, but I never put much time into figuring that out. If you build a solution for it, please share.