I like how beau's version collapses the nav buttons when you scroll up or down the page on my iPad. I haven't taken a look to see if it was intentional or a bug

I like how beau's version collapses the nav buttons when you scroll up or down the page on my iPad. I haven't taken a look to see if it was intentional or a bug; but it's neat nontheless, if a user decided to scroll, I think that the nav should collapse out of the way. Can anyone comment on how the iOS path app behaves when you scroll?