Strange infowindow background problem

I'm having a strange problem with infowindows and the way that they
display. When the infowindow opens, it draws on top of a white shape
instead of the background of the shadow being transparent.

You can see the map at:

http://reports.ottawabikingproblems.ca/

When you click a button on the right sidebar, it'll launch an
appropriate infowindow on the map. Clicking on the markers does the
same thing.

I see it on firefox 3.6.3 and safari 5.

This is all very hard to explain, but you'll understand when you see
it. It is also hard to search for similiar problems as it is hard to
describe verbally.

Any help would be very much appreciated...

- A

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