how to change the close button in the infowindow (bubble)?

i want to customize the closebuttons in the info-windows (info-bubbles) on google maps u开发者_开发技巧sing api v.3. is there an easy way? meaning the api is providing this capability, or is there a good workaround out there.

thanks for help.

UPDATE

i have to add, that i want to change the style or at least the image.

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You could use the InfoBox extention which is part of the gmaps-samples-v3 project on Google Code. That allows you to style the info window.