global.js

// Adjust header when scrolled
// Author: Bill Erickson
// URL: http://www.billerickson.net/code/adjust-header-scrolled/

jQuery(document).ready(function($){
    $(".site-header").after('<div class="bumper"></div>');
    $(window).scroll(function () {
	  if ($(document).scrollTop() > 1 ) {
	    $('.site-header').addClass('shrink');
	  } else {
	    $('.site-header').removeClass('shrink');
	  }
	});
});