title: Error: 'jQuery is not defined'
body: <p>I have written a script with jQuery.
  It works with Firefox and GoogleChrome.
  Only with IE I have this error returned:</p>
  
  <blockquote>
    <p>'jQuery' is not defined  jquery-ui-1.8.4.custom.min.js, Row 10 Character 1</p>
  </blockquote>
  
  <p>This is the head of my page:</p>
  
  <pre><code>    &lt;head&gt;
      &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
      &lt;title&gt;Contattaci - TheItalianBrand.com&lt;/title&gt;
      &lt;script type="text/javascript" src="lib/jquery.js"&gt;&lt;/script&gt;
      &lt;script type="text/javascript" src="lib/js/jquery-ui-1.8.4.custom.min.js"&gt;&lt;/script&gt;
      &lt;link type="text/css" href="lib/css/smoothness/jquery-ui-1.8.4.custom.css" rel="stylesheet" /&gt; 
      &lt;script type="application/javascript"&gt;
         $(function(){
  
  
  
      $('#dialog_link, ul#icons li').hover(
       function() { $(this).addClass('ui-state-hover'); }, 
       function() { $(this).removeClass('ui-state-hover'); }
      );
  
      $('input').change(function() {
        validate();
      });
      $('input').keydown(function() {
        validate();
      });
      $('textarea').change(function() {
        validate();
      });
      $('textarea').keydown(function() {
        validate();
      });
     });
     &lt;/script&gt;
     &lt;/head&gt;
  </code></pre>
  
  <p>What can I do?</p>