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/src/CastDocumentRangeTest.java

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exception is expected.
ACTUAL -
The following exception is thrown:
java.lang.ClassCastException: sun.plugin.dom.html.HTMLDocument cannot be cast to org.w3c.dom.ranges.DocumentRange
at CastDocumentRangeTest.init(CastDocumentRangeTest.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/CastDocumentRangeTest.java