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$(document).ready(function() { // grab the initial top offset of the navigation var stickyNavTop = $('.nav').offset().top; // our function that decides weather the navigation bar should have "fixed" css position or not. var stickyNav = function(){ var scrollTop = $(window).scrollTop(); // our current vertical position from the top // if we've scrolled more than the navigation, change its position to fixed to stick to top, // otherwise change it back to relative if (scrollTop > stickyNavTop) { $('.nav').addClass('sticky'); } else { $('.nav').removeClass('sticky'); } }; stickyNav(); // and run it again every time you scroll $(window).scroll(function() { stickyNav(); }); });