title: JavaScript error says "confirm is not a function"
body: <p>I'm using jQuery with the validation plugin when I submit a form:</p>
  
  <pre><code>$('.frmProject:visible').validate( {
  
      errorContainer: ".site_details:visible .messageBox1",
      errorLabelContainer: ".site_details:visible .messageBox1 span.messagehere",
      invalidHandler: function(form, validator) {
      },
  
      rules: {
          site_id: {
              required: true,
          }
      },
      messages: {
          site_id: "Project has no assigned site information. Click the marker on the map at left to specify the site where this project took place."
      },
      submitHandler: function(data) {
          SaveProject();
      }
  
  });
  </code></pre>
  
  <p>In the submitHandler,</p>
  
  <pre><code>function SaveProject(){
      //... load variables with input contents
      $.ajax({
          url: 'ajax/save_project.php',
          dataType: 'json',
          data: 'id='+id+'&amp;title='+title+'&amp;project='+project+'&amp;sector='+sector+'&amp;volunteer='+volunteer+'&amp;lat='+lat+'&amp;lng='+lng+'&amp;name='+name+'&amp;mun='+mun+'&amp;prov='+prov,
          success: function(data) {
              //... load 'messages' object with stuff
              $.each(messages, function(key, value) {
                  if (confirm(key)){
                      console.log(item);
                  }
              });
          }
      });
  }
  </code></pre>
  
  <p>When I submit the validated form and it gets to the confirm inside the each loop, I get the error message: "confirm is not a function".</p>
  
  <p>How can I present a message to the user for confirmation?</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>When I type "confirm" into the console I get this:</p>
  
  <p><img src="https://i.stack.imgur.com/DjGrT.png" alt="Screen capture of console output"></p>
  
  <p>Inspecting in DOM reveals:</p>
  
  <p><em>window > confirm()
  There are no properties to show for this object.</em></p>
  
  <p>Inspecting in Script takes me to a place in jquery-1.6.2.min.js</p>