title: Include external JS file from base page
body: <p>For my pages which implement feature X I have them implement a base class (which itself implements the original base). 
  <br/><br/>This feature X base class has some web methods, and I'd like the javascript that's required in using those web methods to be included in the concrete page's  in the form: </p>
  
  <pre><code>&lt;SCRIPT language="JavaScript" src="FeatureX.js"&gt;&lt;/SCRIPT&gt;
  </code></pre>
  
  <p>I thought it would be as simple as adding the attribute to base.Header in the base class - but it's null.<br/><br/> From googling and searching SO it seems I should be making a new master page, as this is related to presentation. However that seems like overkill for one include statement. Is there some way I can add this straight from the base class? <br/><br/>Thanks.   </p>