title: setInterval Doesn't Increase var Value
body: <p>This code should change the #magia div's content every three seconds but it doesn't change it.</p>
  
  <pre><code>$(function(){
      var NArray = -1;
      var ringraziamenti = ["", "Thanks", 
      "You saved my Website", 
      "Now you can use it, and try to find all the hidden tresure that there are", 
      "Good Luck"
      ];
      $("#Save").click(function(){
              setInterval(function(){
              NArray = NArray + 1;
      $("#magia").html(ringraziamenti[NArray]);
    }, 3000);
  }
  );
  });
  </code></pre>