def link_to_route(text, destination_id, source_id = nil, *args)
      function = "CCPEVE.showRouteTo(#{destination_id.inspect}"
      function.concat ", #{source_id.inspect}" if source_id
      function.concat ")"
      link_to_function text, function, *args
    end
def link_to_route(text, destination_id, source_id = nil, *args)
      function = "CCPEVE.showRouteTo(#{destination_id.inspect}"
      function.concat ", #{source_id.inspect}" if source_id
      function.concat ")"
      link_to_function text, function, *args
    end
Creates a hyperlink that results in showing the route to the destination_id from the source_id.
 If source_id is not given, the source system is taken to be the system the user is currently in.