[Google Maps API v2] migrating from v2 to v3

Hi i have 1 question and a problem - PLEASE HELP

the load code below - should the 2 not be a 3?

<script type="text/javascript">

  google.load("maps", "2",{"other_params":"sensor=true"});

my big problem - unable to add  and delete markers on map with the old code though i have replaced the G with google.maps.

<script type="text/javascript">

 var map = new google.maps.Map(document.getElementById("map"));

 map.addControl(new google.maps.SmallMapControl());

 map.addControl(new google.maps.MapTypeControl());

 var homeIcon = new google.maps.Icon(); 

 homeIcon.image = "http://chart.apis.google.com/chart?chst=d_map_pin_icon&chld=home|B6D4E8";

 homeIcon.shadow = "http://chart.apis.google.com/chart?chst=d_map_pin_shadow"; 

 homeIcon.iconSize = new google.maps.Size(24, 40); 

 homeIcon.shadowSize = new google.maps.Size(44, 40); 

 homeIcon.iconAnchor = new google.maps.Point(12, 40); 

 homeIcon.infoWindowAnchor = new google.maps.Point(12, 2); 

 markerOptions = { icon:homeIcon };

 var lat = document.getElementById("latitude").value;

 var lon = document.getElementById("longitude").value;

 if (lat == 0 || lon == 0)

 {

 map.centerAndZoom(new google.maps.Point(-9.3603515625,38.777640223073), 8);

 } else

 {

 var house = new google.maps.Point(lon,lat);

 map.centerAndZoom(house, 8);

 var marker = new google.maps.Marker(house, markerOptions);

 map.addOverlay(marker);

 }

 google.maps.event.addListener(map, 'click', function(overlay, point) {

 if (overlay) {

 map.removeOverlay(overlay);

                  document.getElementById("latitude").value=0;

                  document.getElementById("longitude").value=0;

} else if (point) {

 map.recenterOrPanToLatLng(point);

 var marker = new google.maps.Marker(point, markerOptions);

 map.addOverlay(marker);

  }

  });

 google.maps.event.addListener(map, 'click', function(overlay, point) {

 document.getElementById("latitude").value=point.y;

 document.getElementById("longitude").value=point.x;

 });

</script>

Thanks

Melanie

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