$(window).load(function() {
  
    
    //main menu fixed position on scroll
    $(window).scroll(function () {
      moveMenu();
    });

    //put menu in the right place
    moveMenu();   
 
  }

);

function moveMenu(){
  var scroll_top = $(document).scrollTop();  
  if(scroll_top >= 1630){
    $('#s04').css('position', 'fixed');
    $('#s04').css('top', '0px');
    //$('#lead').css('margin-bottom', '92px');
  } else {
    $('#s04').css('position', '');
    $('#s04').css('top', '');
    //$('#lead').css('margin-bottom', '');
  }

  if(scroll_top < 1630){
    resetMenu();
  }

scroll_top = scroll_top+1;
  /*if(scroll_top > overview_top){resetMenu();$('#s04 ul li:nth-child(1) a').addClass('selected');}
  if(scroll_top > the_process_top){resetMenu();$('#s04 ul li:nth-child(2) a').addClass('selected');}
  if(scroll_top > the_topics_top){resetMenu();$('#s04 ul li:nth-child(3) a').addClass('selected');}
  if(scroll_top > ordering_top){resetMenu();$('#s04 ul li:nth-child(4) a').addClass('selected');}*/
}

function resetMenu(){
  $('#s04 a').removeClass('selected');
}