If I remember correctly, IE supports transparent png files since version 7, for earlier versions there is a png fix via css. google for it and add it to your project but be aware it might take some time to render the images, depends on how many png files you'll have on the page and how you setup the png fix.
http://www.twinhelix.com/css/iepngfix/ -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
