[Zope] Site Error Messages

I am trying to disable the traceback which appears in site error messages under "view source". I located Application.py under lib/python/OFS and also HTTPResponse.py under lib/python/ZPublisher, but am not sure where to go from here. I was able to make "site maintainer" hot using mailto:, and got rid of the paragraph telling you to view source, but I cannot figure out how to eliminate the traceback. Any suggestions? -- Michael Lewis