title: Get parameter from JSON
body: <p>In <code>data</code> from server I get the following JSON:</p>
  
  <pre><code>{
      "response": {
          "upload_url": "http:\/\/cs9458.vk.com\/upload.php?act=do_add&amp;mid=6299927&amp;aid=-14&amp;gid=0&amp;hash=73e525a1e2f4e6a0f5fb4c171d0fa3e5&amp;rhash=bb38f2754c32af9252326317491a2c31&amp;swfupload=1&amp;api=1&amp;wallphoto=1",
          "aid": -14,
          "mid": 6299927
      }
  }
  </code></pre>
  
  <p>I need to get <code>upload_url</code>. I'm doing:</p>
  
  <pre><code>function (data) {
      var arrg = JSON.parse(data);
      alert(data.upload_url);
  });
  </code></pre>
  
  <p>but it doesn't work (alert doesn't show).</p>
  
  <p>How do I get parameter <code>upload_url</code>?</p>