I want to configure jboss 3.2.3 with xerces 1.4.4

Can anyone tell me what the procedure to do this is?

I tried the below procedure but it doesnt seem to work...
1) Removed the xercesImpl.jar and xml-apis.jar from the lib folder
2) placed the 1.4.4. xerces.jar in the lib folder
3) modified the run.bat by adding the following 2 lines:
JAXP=-Djavax.xml.parsers.DocumentBuilderFactory=org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
JAXP="$JAXP -Djavax.xml.parsers.SAXParserFactory=org.apache.xerces.jaxp.SAXParserFactoryImpl"

Thanks
Pratima