molti markers su mappa stesse coordinate

[havana1977]

Ciao a tutti, ho trovato uno script per evitare di non poter cliccare un marker nascosto da un altro nelle stesse precise coordinate.
Quello che non riesco a fare è integrare il codice con il mio, mi dareste una mano?

quà c'è lo script, guardate la sorgente: http://williams.edu/Economics/ArtsEc...intabsdemo.htm

qui invece posto il mio codice:

<script type="text/javascript" src="markercluster.js"></script>   
 
    <script type="text/javascript">
    //<![CDATA[
			   
var baseIcon;
			   

var data = null;
var row_no = 0;
var map = null;
var mgr = null;
var markers = [];
var markerClusterer = null;




      
      

      function initialize() {
        	if(GBrowserIsCompatible()) {
				
          map = new GMap2(document.getElementById('map'));
          map.setCenter(new GLatLng(1, -1), 2);
          var mapui = map.getDefaultUI();
   		  mapui.maptypes.physical = false;
          map.setUI(mapui);
          map.setMapType(G_HYBRID_MAP);
		  
		  }
		
		baseIcon = new GIcon(G_DEFAULT_ICON);
		baseIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
		baseIcon.iconSize = new GSize(20, 34);
		baseIcon.shadowSize = new GSize(37, 34);
		baseIcon.iconAnchor = new GPoint(9, 34);
		baseIcon.infoWindowAnchor = new GPoint(9, 2);
		
		
		
		var helpString = '';
	GDownloadUrl("geokml.php", function(data) {
		var xml = GXml.parse(data);
		var myMarkers = xml.documentElement.getElementsByTagName("marker");
		
		
		
		
        for (var i = 0; i < myMarkers.length; i++) {
        var name = myMarkers[i].getAttribute('name');
        var address = myMarkers[i].getAttribute('address');
        var link = myMarkers[i].getAttribute('link');
		var cat = myMarkers[i].getAttribute("cat");
        var point = new GLatLng(parseFloat(myMarkers[i].getAttribute('lat')),
                                 parseFloat(myMarkers[i].getAttribute('lng')));
		 var marker = createMarker(point, name, address, link, cat);
 		markers.push(marker);
		
		 // var sidebar = document.getElementById('sidebar');
		  
	    if (markers.length == 0) {
       //sidebar.innerHTML = 'No results found.';
       
       return;
       }
	  // var sidebarEntry = createSidebarEntry(marker, name, address, link, cat);
        //sidebar.appendChild(sidebarEntry);
		
		
	
		
		}
		
		
		
		
		
         var mcOptions = { gridSize: 50, maxZoom: 10 };
		var markerCluster = new MarkerClusterer(map, markers, mcOptions);
		
		map.getContainer().style.overflow="hidden"; 
		
        });
	
	
	
	
	
		  function createMarker(point, name, address, link, cat) {
      var marker = new GMarker(point, customIcons[cat]);
      var html = '' + name + ' 
' + address;
      GEvent.addListener(marker, 'click', function() {
        marker.openInfoWindowHtml(html);
      });
      return marker;
    }
	
   }
	
	function createSidebarEntry(marker, name, address, link, cat) {
      var div = document.createElement('div');
      var html = '' + name + '
' + address;
      div.innerHTML = html;
      div.style.cursor = 'pointer';
      div.style.marginBottom = '5px'; 
      GEvent.addDomListener(div, 'click', function() {
      GEvent.trigger(marker, 'click');
      });
      GEvent.addDomListener(div, 'mouseover', function() {
      div.style.backgroundColor = '#eee';
      });
      GEvent.addDomListener(div, 'mouseout', function() {
      div.style.backgroundColor = '#fff';
      });
      return div;
      }
		
	    //]]>
  </script>