Opening KMZ file in your browser using Google Map API

Google Map can read KML/KMZ files, so you can share your data created in google earth with google map. This is handled by GGeoXml object.

Here’s an example how to view data from a kml/kmz file using google API

    var map;
    var geoXml;
    function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map_canvas"));
        map.setCenter(new GLatLng(0,0));
        geoXml = new GGeoXml(hostname + kmzfile, function() {
         zoomToGeoXML(geoXml); // centering the map according to the kml data
        });
      }
    } 

    //Zoom the map
    function zoomToGeoXML(geoXml) {
        var center = geoXml.getDefaultCenter();
        var span = geoXml.getDefaultSpan();
        var sw = new GLatLng(center.lat() - span.lat() / 2,
                        center.lng() - span.lng() / 2);
        var ne = new GLatLng(center.lat() + span.lat() / 2,
                        center.lng() + span.lng() / 2);
        var bounds = new GLatLngBounds(sw, ne);
        map.setCenter(center);
        map.setZoom(map.getBoundsZoomLevel(bounds));
        map.addOverlay(geoXml);
    }

and here is a working example

This page outlines KML support in Google Maps and Google Maps for mobile.