STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. open the following url with java console open:
http://sqeweb/jsn/users/fred/deployment_ws/fred/deployment_6_UR_int_ws/deployment/src/plugin/FunctionalTest/FunctionalTest/html/CastDocumentTraversalTest.html

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exception will be printed in console and string "object type cast success" will be printed.
ACTUAL -
The following exception is printed:
java.lang.ClassCastException: sun.plugin.dom.html.HTMLDocument cannot be cast to org.w3c.dom.traversal.DocumentTraversal
at CastDocumentTraversalTest.init(CastDocumentTraversalTest.java:21)

REPRODUCIBILITY :
This bug can be reproduced always.

The applet source code is:
http://sqeweb/jsn/users/fred/deployment_ws/fred/deployment_6_UR_int_ws/deployment/src/plugin/FunctionalTest/FunctionalTest/src/CastDocumentTraversalTest.java