var gmap = null;

AddOnLoadFunction("LoadGoogleMap", "LoadGoogleMap()");
AddOnUnloadFunction("GUnload", "GUnload()");

function LoadGoogleMap()
{   
    if (GBrowserIsCompatible()) 
    {
        var pointCenter = new GLatLng(46.620940, -20);
        var point = new GLatLng(46.620940, -70.673410);
    
        gmap = new GMap2(document.getElementById("map"));
        gmap.setCenter(pointCenter, 1/*2*/);
        gmap.addControl(new GLargeMapControl());

        AddMarker(point);
    }
}

function AddMarker(point)
{
    var marker = new GMarker(point);
    gmap.addOverlay(marker);
}