how to use JAXP in applet?

how to use JAXP in applet?
hi,
The codes as following really do work, but when I add them to a Applet,error occured:
Output method is xml could not load output_xml.properties<check CLASSPATH>
at org.apache.xalan.templates.OutputProperties......

I never set classpath after all. I just copied the .jar files from JAXP 1.4 to java\j2re1.4.0\lib\ext\
thanks in advance!

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.dom.DOMSource;
import java.io.*;
import org.w3c.dom.*;


public class XmlString
{    
  public static void main(String[] args)
  {    
         
    try
    {
      DocumentBuilderFactory docFac = DocumentBuilderFactory.newInstance();    
       DocumentBuilder db = docFac.newDocumentBuilder();    
      Document m_dDoc = db.newDocument();
      Element   e1=m_dDoc.createElement("first");
      Text tx;
      tx=m_dDoc.createTextNode("hi");
      e1.appendChild(tx);/* */    
      m_dDoc.appendChild(e1);
       TransformerFactory tfac = TransformerFactory.newInstance();    
       StringWriter strWtr = new StringWriter();    
       StreamResult strResult = new StreamResult(strWtr);    
       Transformer trans = tfac.newTransformer();    
       trans.transform(new DOMSource(m_dDoc.getDocumentElement()), strResult);    
       System.out.println(strResult.getWriter().toString());
     }
     catch(Exception e)
     {
     }

   } // main
}