title: Setting a default value to a param in s:include
body: <p>I am writing a small widget in struts which I want to include.  The height of the widget should be auto unless I pass in a param of height.  For example:</p>
  
  <pre><code># Example 1:
  &lt;s:include value="myWidget.jsp"&gt;
    &lt;s:param name="height"&gt;300 px&lt;/s:param&gt;
  &lt;/s:include&gt;
  
  # Example 2:
  &lt;s:include value="myWidget.jsp"&gt;
  &lt;/s:include&gt;
  </code></pre>
  
  <p>Inside myWidget.jsp I can access the value of height using ${param.height}.  But if I don't pass the height param it simple comes across as blank.  I want to set the value explicitly to "auto", how can I do this? </p>