> I can't make the goddamn snapped polyline withou having one alert
> before, or else no point appear.

This is a clue that you haven't grasped the asynchronous nature of
GXmlHttp and GDirections etc.
Have another look at-
http://econym.org.uk/gmap/async.htm

Yes, if you can master that you can update the map rather than re-
creating it.

cheers, Ross K

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