IIS and Exchange 2000 Issues

Hi - I have set up IIS to serve webpages on my Windows 2000 Server but am having some problems. The machine does not want to serve images! Each time I visit my site outside the firewall I am getting broken image links, but images do display when I visit the site from within my network. The image links look something like: The web address is www.rockstarbusiness.co.uk. Does anybody have any idea where I should be looking? I have shared the folders and ensure the IUSR account has at least read access to the images directory. is this a feature of IIS? >-(

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