Code to switch stationary navbar to fixed - Bootstrap

 $(window).load(function() {
    // fix sub nav on scroll
    var $win = $(window)
      , $nav = $('.navbar')
      , $nC = $('#navCont')
      , navTop = $('.navbar').length && $('.navbar').offset().top + 20
      , isFixed = 0

    $nav.addClass('auto-size');

    processScroll()

    $nC.addClass('auto-size')
    $win.on('scroll', processScroll)

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

<!-- Put this in your stylesheet -->
.auto-size { width: auto; }