simple static nav function

sticky-nav.js

    // sticky nav
    function stickyNav() {
      
      if (!!$('.sticky').offset()) { // make sure ".sticky" element exists
        
        var stickyTop = $('.sticky').offset().top; // returns number
        
        $(window).scroll(function(){ // scroll event
        	var windowTop = $(window).scrollTop(); // returns number
         	if (stickyTop < windowTop){
            	$('.sticky').css({ position: 'fixed', top: 0 });
          	}
          	else {
            	$('.sticky').css('position','static');
          	}
        });
      }
    }
    stickyNav();