Jaxp & Java Problem

I'm getting

Exception in thread "main" java.lang.NoclassDefFound : org/xml/sax/helpers/DefaultHandlers.

xalan.jar,jaxp.jar, and crimson.jar are in

c:\jdk1.3.3\jre\lib\ext

I tried creating a CLASSPATH environment variable but that didn't work either. Can any one give me a procedure to follow that will straighten this out.

[364 byte] By [wma453] at [2007-9-26 2:16:34]