@paul2009 - thanks for the code above - I've added it to my site, and it's getting me close to what I want ( www.rushofitall.com ), but there are a few more adjustments I'd like to make:
1) I'd like the nav items that have internally wrapped to a second line to center justify (they're right-justified now) [I self-solved this one - just added "text-align: center;"]
2) I'd like the whole nav bar to never wrap to a second line (so individual items wrap internally, but the whole line never wraps, but instead switches to the hamburger symbol when browser window is too narrow).
3) I'd like drop-down nav items (items in a navigation folder, like those under "Projects" on my site) to display full length when they show, without wrapping internally.
Any suggestions?