I am currently using the Google Maps MarkerClusterer v3 (http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/docs/reference.html) and have been very impressed with the functionality so far.
However, I now wish to add in an additional function to my map. When a user hovers over a list of the markers, the marker image is changed. This works great when the markers aren't clustered, but since I am also using the Clusterer, I need to be able to return the Cluster to which a specific marker belongs.
Does anyone know if this is possible? I checked the API documents, but couldn't find a method to return an array of the Clusters.