function load_map_data() {
   var latlng;
   var marker;
   var mc;
   var styles; 
   var markers= [];
   mc = new MarkerClusterer(map);
   styles = [{
        url: '/halloween/maps/2009/people35.png',
        height: 35,
        width: 35,
        opt_anchor: [15,0],
        opt_textColor: '#DDDDFF'
      },
      {
        url: '/halloween/maps/2009/people45.png',
        height: 45,
        width: 45,
        opt_anchor: [25, 0],
        opt_textColor: '#AAFFAA'
      },
      {
        url: '/halloween/maps/2009/people55.png',
        height: 55,
        width: 55,
        opt_anchor: [32, 0],
        opt_textColor: '#FFAAAA'
      },
   ];

   for (var i = 0; i < 1000; ++i) {
      latlng = new GLatLng(holidays_lat_long[i].la, holidays_lat_long[i].lo);
      marker = new GMarker(latlng, {icon: icon});
      markers.push(marker);
   }
   var markerCluster = new MarkerClusterer(map, markers, {gridSize:25, styles:styles});
}