Scroll Style

gistfile1.js

var $win = $(window)
      , $nav = $('.subnav')
      , navTop = $('.subnav').length && $('.subnav').offset().top - 40
      , isFixed = 0

    processScroll()

    // hack sad times - holdover until rewrite for 2.1
    $nav.on('click', function () {
      if (!isFixed) setTimeout(function () {  $win.scrollTop($win.scrollTop() - 47) }, 10)
    })

    $win.on('scroll', processScroll)

    function processScroll() {
      var i, scrollTop = $win.scrollTop()
      if (scrollTop >= navTop && !isFixed) {
        isFixed = 1
        $nav.addClass('subnav-fixed')
      } else if (scrollTop <= navTop && isFixed) {
        isFixed = 0
        $nav.removeClass('subnav-fixed')
      }
    }