> So, do you mean to change the addListener-fct. or its parameters?

This begins your click listener -
    GEvent.addListener(this.map, "click", function(overlay, latlng)
{ ...
but you can't change what parameters are given to it by the API when
the map is clicked
http://code.google.com/apis/maps/documentation/reference.html#GMap2.click

> Which fct. do I have to choose?

This is where your listener checks to see if an overlay has been
clicked
     if (overlay) { ...
but what you would need to do is extend that to see if the overlay
clicked was a GMarker.
http://javascript.about.com/od/reference/g/rtypeof.htm

> The other example which I mentioned was centered on the greece islands
> (cyclades). Actually there are plenty of postal addresses, but the
> marker moved to Athens, which is easily more than 100kms away.

" ... nearest postal address, that it knows about"
Google's API geocoder does not cover 100% of the addresses in the
world.
The API geocoder is not the same as maps.google.com geocoder.
There are alternative reverse geocoders
http://groups.google.com/group/google-maps-api/web/resources-non-google-geocoders
which may do better or worse with any given location.

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