This was probably done by editing Spark's source and compiling own branded version. Can't say which file of the source you should edit (maybe in ChatFrame.java file). If you are not a java programmer, then you should find one, or the one who did these changes. Maybe he can send you edited java file or point where those changes should be made. Then you can download the source, replace the file, compile new version, take the spark.jar file and replace it on every computer in Program files\Spark\lib
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