(function(){

  "use strict";

  var blur = false;

  var blurbutton = document.getElementById("buttontoblur");

  blurbutton.addEventListener("click",function(){

    blur = blurIzetta(blur);

  });

  function blurIzetta(bool)

  {

    var izetta = document.getElementById("imagetoblur");

    if (bool == false)

    {

      bool = true;

      izetta.style.filter="blur(20px)";

    }

    else

    {

      bool = false;

      izetta.style.filter="blur(0px)";

    }

    return bool;

  }

})();