asp:ImageMap png / jpg images not rendering properly

Hi,
I have a page where an image does render properly in Chrome, Safari, Firefox unless I set the image type to .gif:




<asp:ImageMap ID="ImageMapTFS" runat="server" HotSpotMode="Navigate"            ImageUrl="~/images/TFS.VS2010_Stack.gif">               <asp:RectangleHotSpot Bottom="289" HotSpotMode="Navigate" 

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