title: Xenu link checker can't see the url links in html code
body: <p>I need to check with Xenu application a view links on my www site.</p>
  
  <p>On my site there is HTML code.</p>
  
  <pre><code>&lt;img src="mysite/pictures.php?url=http://othersite.com/pic1.jpg"&gt;
  &lt;img src="mysite/pictures.php?url=http://othersite.com/pic2.jpg"&gt;
  &lt;img src="mysite/pictures.php?url=http://othersite.com/pic3.jpg"&gt;
  </code></pre>
  
  <p>But Xenu cannot check if pictures exist or not. How I can do it with some script inside <code>pictures.php</code>?</p>
  
  <p>I need to check for example if the link in parameter <code>url=http://othersite.com/pic1.jpg</code> is a JPG picture.
  I can't change the HTML code because it must be constant. So I have to do it with some PHP script.</p>