title: Jquery UI effects don't work
body: <p>I'm using latest version of both <code>jQuery</code> and <code>jQuery UI</code> scripts, the problem is that actually can't set any <code>div</code> to animate using UI effects (toggle, slide, opacity, etc.). </p>
  
  <pre><code>$('#tabs').tabs( {
      fx: [ { 
          opacity:'toggle', 
          duration:'normal'
      },   // hide option
      {   opacity:'toggle',
          duration:'fast'
      }]
  }); // show option
  </code></pre>
  
  <p>The UI tabs works, but don't make any animation when I add the fx parameters. It just shows or hides the tabs, but with no animation at all.</p>
  
  <p>Just downloaded the latest versions today, for the UI have downloaded a custom bundle including ALL the things (effects included, of course).</p>
  
  <p>Don't know if I must use a different bundle.</p>