title: Call a function only once
body: <p>I've 3 divs (<code>#Mask #Intro #Container</code>) so if you click on Mask, Intro gets hidden and Container appears.
  The problem is that I just want to load this only one time, not every time I refresh the page or anytime I click on the menu or a link, etc.</p>
  
  <p>How can I do this?</p>
  
  <p>This is the script I'm using for now:</p>
  
  <pre><code>$(document).ready(function(){
      $("div#mask").click(function() {
          $("div#intro").fadeToggle('slow');
          $("div#container").fadeToggle('slow');
          $("div#mask").css("z-index", "-99");
      });
  });
  </code></pre>
  
  <p>Thank you!</p>