Use Google Maps Bubble as a Custom Tooltip Background

I want to use the Google Maps "bubble" in my web site. It pops up when you click on a pin...

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Has anybody done this? I can't even find the required image(s) using Firebug. If I can just find the image(s) that powers this bubble, I can handle the rest!

These are the images being used, presumably as sprites:

• Popup
• Shadow

Not sure you're at liberty to use them, tho