$(document).ready(function () {
  var scroll = window.requestAnimationFrame ||
    function (callback) {
      window.setTimeout(callback,
        1000 / 60)
    };
  var elementsToShow = document.querySelectorAll('.show-on-scroll');
  function loop() {
    elementsToShow.forEach(function (element) {
      if (isElementInViewport(element)) {
        element.classList.add('is-visible');
      } else {
        element.classList.remove('is-visible');
      }
    });
    scroll(loop);
  }
  loop();

  function isElementInViewport(el) {
    // special bonus for those using jQuery
    if (typeof jQuery === "function" && el instanceof jQuery) {
      el = el[0];
    }
    var rect = el.getBoundingClientRect();
    return (
      (rect.top <= 0
        && rect.bottom >= 0)
      ||
      (rect.bottom >= (window.innerHeight || document.documentElement.clientHeight) &&
        rect.top <= (window.innerHeight || document.documentElement.clientHeight))
      ||
      (rect.top >= 0 &&
        rect.bottom <= (window.innerHeight || document.documentElement.clientHeight))
    );
  }

  const callback = function (entries) {
    entries.forEach(entry => {
      entry.target.classList.toggle("is-visible");
    });
  };

  const observer = new IntersectionObserver(callback);

  const targets = document.querySelectorAll(".show-on-scroll");
  targets.forEach(function (target) {
    observer.observe(target);
  });
  // alert('ready!');

  $("#zoom_09").ezPlus({
    gallery: "gallery_09",
    galleryActiveClass: "active"
  });



    
  

});