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/InvalidMediaAppendTest.html

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
A DOMException with code INVALID_CHARACTER_ERR is thrown

ACTUAL -
The following strings are printed:
#### no exception is raised when appending an invalid media:thisIsAnInvalidMedia
#### InvalidMediaAppendTestmoidfy test failed

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/InvalidMediaAppendTest.java