JS array problem

Hi,

I’m writing plugin with Google Maps and I have a code:

function show_all( id )
{
  var url = '../wp-content/plugins/GoogleMaps/xml_gen.php?id='+id;
  var markers_arr = [];
  GDownloadUrl( url, function( data, response )
  {
    var xml = GXml.parse( data );
    var markers = xml.documentElement.getElementsByTagName( "marker" );
    map.setCenter( new GLatLng( parseFloat( markers[0].getAttribute( "lat" ) ), parseFloat( markers[0].getAttribute( "lng" ) ) ), 12 );
    for( var i = 0; i < markers.length; i++ )
    {
      var point = new GLatLng( parseFloat( markers[i].getAttribute( "lat" ) ), parseFloat( markers[i].getAttribute( "lng" ) ) );
      var marker = new GMarker( point );
      markers_arr[i] = marker;
      marker.txt = markers[i].getAttribute( "etiq" );
      map.addOverlay( marker );
    }
  } );
 for( var j = 0; j < markers_arr.length; j++ )
 {
         alert( markers_arr[j].getPoint() );
         document.getElementById( "status" ).innerHTML += markers_arr[j].getPoint()+" ";
 }
}

It is in admin.js file and is used only by Administrator pages. The problem is with arrays because I can’t see any alert after invoking this function. What’s wrong with it? When I have i simple HTML page it works. I include JS code in this way:

add_action( 'admin_print_scripts', array( &$gm, 'JSAdminOutput' ) );

And method JSAdminOutput looks like this:

public function JSAdminOutput()
    {
      echo "<script type='text/javascript' src='".get_option( 'siteurl' )."/wp-content/plugins/GoogleMaps/js/admin.js'></script>";
      echo "<script src='http://maps.google.com/maps?file=api&v=2&key=".($this->api_key)."' type='text/javascript'></script> ";
    }

Thanks for any responses and tips 🙂