"

From 2014.igem.org

/**

************************************************************
*************** THIS IS THE NAVIGATION CODE ****************
************************************************************
**/

$(document).ready(function () {

   $(window).bind('scroll', function () {
       var navHeight = 180;
       if ($(window).scrollTop() > navHeight) {
           $('#navWrap').addClass('fixed');
       } else {
           $('#navWrap').removeClass('fixed');
       }
   });

});