title: knockout.js-ko not found
body: <p>this is my js file:</p>
  
  <pre><code>function AppViewModel() 
  {
      this.firstName = ko.observable("Bert");
      this.lastName = ko.observable("Bertington");
  }
  ko.applyBindings(AppViewModel());
  </code></pre>
  
  <p>this is my html file:</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
      &lt;script type='text/javascript' src='ko.js'&gt;&lt;/script&gt;
      &lt;script type='text/javascript' src='knockout-2.1.0.debug.js'&gt;&lt;/script&gt;
  
  &lt;/head&gt;
  &lt;body&gt;
      &lt;p&gt;First name: &lt;strong data-bind="text: firstName"&gt;&lt;/strong&gt;&lt;/p&gt;
      &lt;p&gt;Last name: &lt;strong data-bind="text: lastName"&gt;&lt;/strong&gt;&lt;/p&gt;
  
      &lt;p&gt;First name: &lt;input data-bind="value: firstName" /&gt;&lt;/p&gt;
      &lt;p&gt;Last name: &lt;input data-bind="value: lastName" /&gt;&lt;/p&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p><strong>Uncaught ReferenceError: ko is not defined</strong>. </p>
  
  <p>Can someone help me with this ?</p>
  
  <p>Thanks in advance </p>