$(document).ready(function(){

  isStickyElementFixed = false;
  winScrollY = 0;
  stickyElementSetPoint = 0;
  stickyElementY = 0;
  screenWidth =  window.innerWidth;
  screenHeight =  window.innerHeight;
  winScrollY = 0;
  stickyElementTop = 0;
  stickyElementDisabled = false;
  headerVisiblePos = 0;
  headerFixedPos = 0;
  isHeaderFixed = false;
  isHeaderVisible = false;
  headerHeight = 0;


  var headerHeight = 0,
      headerVisiblePos = 0,
  	headerFixedPos = 0,
  	isHeaderFixed = false,
  	isHeaderVisible = false;

  function stickyMenu(){
      if($('.main-nav').hasClass('sticky')){
          window.addEventListener('scroll', function(e){
              var screenTop = $(window).scrollTop();
              if (screenTop > 0 ) {
                  $('.main-nav').addClass('shrink');
              }
              if (screenTop <= 0 ) {
                  $('.main-nav').removeClass('shrink');
              }
          });
  		var screenTop = $(window).scrollTop();
  		if (screenTop > 0 ) {
  			$('.main-nav').addClass('shrink');
  		}
      }
  }



stickyMenu();



});