Google maps: how to add a shadow to a custom marker?

Question

I am using the new animation (bouncing) functionality found in the JavaScript API for Google Maps v3.

http://code.google.com/apis/maps/documentation/javascript/overlays.html#MarkerAnimations

In the examples in the linked code above, the map marker icons by default have a sign on the map during the rebound.

I am using a custom map marker icon, which is PNG.

Question . How to create a dropshadow for my custom map marker icon, which will also be displayed when performing an animation effect (rebound)?

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UPDATE

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Here is an example of using the default map marker icon.

http://code.google.com/apis/maps/documentation/javascript/examples/marker-animations-iteration.html

How to do this using a custom map icon that also has a shadow.

Answer 1

.

http://jsfiddle.net/brWhw/

Answer 2

- , :

http://www.cycloloco.com/shadowmaker/shadowmaker.htm