title: JpGraph small demo is not working
body: <p>I'm going to use <a href="http://jpgraph.net/download/" rel="nofollow">JpGraph</a> in my web-project. To do this, I downloaded the library into my project folder and created the following test code:</p>
  
  <pre><code>        &lt;?php
          include ( "jpgraph-3.5.0b1/src/jpgraph.php");
          include ("jpgraph-3.5.0b1/src/jpgraph_gantt.php");
  
          // A new graph with automatic size
          $graph = new GanttGraph (0,0, "auto");
  
          //  A new activity on row '0'
          $activity = new GanttBar (0,"Project", "2001-12-21", "2002-02-20");
          $graph-&gt;Add( $activity);
  
          // Display the Gantt chart
          $graph-&gt;Stroke();
          ?&gt; 
  </code></pre>
  
  <p>The error message is:</p>
  
  <pre><code>The image “http://localhost:10088/test/check.php” cannot be displayed, 
  because it contains errors.
  </code></pre>
  
  <p>What's wrong with my code? In fact, it was just copied from <a href="http://www.aip.de/~weber/doc/jpgraph/docs/html/5gantt.html" rel="nofollow">here</a>. The only thing I changed was the path to the JpGraph library. So, do I need to import this library in some special way into my project (so far, I've just copied the JpGraph's folder into the project's folder)? I'm using Zend Studio.</p>