$(function(){
  $("#scroll-machine").click(function () {
    scroll_screen("#machine");
    return false;
  });

  $("#scroll-flow").click(function () {
    scroll_screen("#flow");
    return false;
  });

  $("#scroll-inspection-equipment").click(function () {
    scroll_screen("#inspection-equipment");
    return false;
  });

  $("#scroll-correspondence").click(function () {
    scroll_screen("#correspondence");
    return false;
  });

  function scroll_screen(id, speed) {
    var target_height = $(id).offset().top;
    var headerHeight = $('#siteheader').height();
    var setHeight = target_height - headerHeight - 40;
    $('html,body').animate({ scrollTop: setHeight}, speed);
  }
});