code: def dquoteEscape(param):
      
      if param.find('"') >= 0:
          raise VObjectError("Double quotes aren't allowed in parameter values.")
      for char in ',;:':
          if param.find(char) >= 0:
              return '"' + param + '"'
      return param
docs: Return param, or "param" if ',' or ';' or ':' is in param.