Get DOM Element of a marker in Google Maps API 3

I've found this method to be useful, although it might not be suitable for all environments. When setting the marker image, add a unique anchor to the URL. For example:

// Create the icon
var icon = new google.maps.MarkerImage(
    "data/ui/marker.png",
    new google.maps.Size(64, 64),
    new google.maps.Point(0,0),
    new google.maps.Point(48, 32)
);

// Determine a unique id somehow, perhaps from your data
var markerId = Math.floor(Math.random() * 1000000);
icon.url += "#" + markerId;

// Set up options for the marker
var marker = new google.maps.Marker({
    map: map,
    optimized: false,
    icon: icon,
    id: markerId,
    uniqueSrc: icon.url
});

Now you have a unique selector i.e.:

$("img[src='data/ui/marker.png#619299']")

or if you have the marker:

$("img[src='" + marker.uniqueSrc + "']")

I was looking for the DOM element too in order to implement a custom tooltip. After a while digging into google overlays, custom libraries and so on, i've ended up with the following solution based on fredrik's title approach (using jQuery) :

google.maps.event.addListener(marker, 'mouseover', function() {

    if (!this.hovercardInitialized) {

        var markerInDOM = $('div[title="' + this.title + '"]').get(0);

        // do whatever you want with the DOM element

        this.hovercardInitialized = true;
    }

});

Hope this helps someone.