>   var resLayer = new google.maps.KmlLayer(kmlUrl + '?dummy=' + (new
> Date()).getTime());
>   resLayer.setMap(map);
>   var newZoom = map.getZoom() + 1;
>   map.setZoom(newZoom);}

KmlLayer acts asynchronously.  It won't have completed by the time you
try to get the zoom level.
You need to wait for the KML action to complete:
http://groups.google.com/group/google-maps-js-api-v3/search?group=google-maps-js-api-v3&q=kml+loaded&qt_g=Search+this+group

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