If you are using Sun JavaTM System Application Server or Sun JavaTM System Web Server, and you make changes to the resource files after you run the configure utility as a result of site changes or customization, you need to redeploy the files to the web container.
Run the redeploy command.
im_svr_base/html/redeploy
Where im_svr_base is the directory in which you installed Instant Messaging.
See the documentation for your web container for additional information.