document.addEventListener(
      "DOMContentLoaded",
      function() {
        const randomNeocat = document
          .querySelector(".neocat");
        const images = [
          "neocat_floof_happy_2048.png",
          "neocat_floof_owo_2048.png"
        ];

        randomNeocat.addEventListener(
          "mouseover",
          function() {
            const randomIndex = Math
              .floor(Math.random() *
                images.length);
            const randomImage =
              images[randomIndex];

            randomNeocat.src =
              randomImage;
          });

        randomNeocat.addEventListener(
          "mouseout",
          function() {
            randomNeocat.src =
              "neocat_floof_mug_2048.png";
          });
      });

    var icons = [
      "neocat_floof_happy_2048.png",
      "neocat_floof_owo_2048.png"
    ];
    var currentIndex = 0;

    function changeFavicon() {
      var favicon = document
        .querySelector(
          "link[rel*='icon']");
      favicon.href = icons[
        currentIndex];

      currentIndex = (currentIndex +
        1) % icons.length;
    }

    setInterval(changeFavicon, 2000);