Google Maps Api V3 - MarkerCluster con icone personalizzate

[Vindav]

var infoHtml = '<div class="info"><div style="float:left;width:100%;">[img]'+logo+'[/img]<h3>' + title +
       '</h3></div><div style="float:left;width:400px;">[url="' + url + '" target="_blank"><img src="][/url]sdasasdasdsad</div>' + 
      '</div>'; 
          
         marker2.infoWindow = new google.maps.InfoWindow({content: infoHtml});

        google.maps.event.addListener(marker2, 'click', function() { 
  
   /* close the previous info-window */ 
  speedTest.closeInfos(); 

   /* the marker's content gets attached to the info-window: */ 
    
     //speedTest.infoWindow.setContent(infoHtml); 
        this.infoWindow.setPosition(myLatlng); 
   /* trigger the infobox's open function */ 
   this.infoWindow.open(speedTest.map,this); 
  
   /* keep the handle, in order to close it on next click