Ok, wait, how does that work, exactly?

Did you replace the images on the server? Wouldn't it have been easier to change the URLs in the reference file?

The C9 emoticons are in http://ecn.channel9.msdn.com/o9/content/images/emoticons/C9/*
& the normal ones are in http://ecn.channel9.msdn.com/o9/content/images/emoticons/*