"

From 2013.igem.org

var offsetHeight = 331;

$('.nav-collapse').scrollspy({

   offset: offsetHeight

});

$('.navbar li a').click(function (event) {

   var scrollPos = $('body').find($(this).attr('href')).offset().top - offsetHeight;
   $('body,html').animate({
       scrollTop: scrollPos
   }, 10000, function () {
       $(".btn-navbar").click();
   });
   return false;

});