Right, their server is detecting the fact that the page requesting the image is not hosted on their server. Providers do this to prevent 'hijacking' of content by simply linking to it from elsewhere. If you consider the bandwidth costs of images versus the HTML file that references them, they'll end up bearing the greater cost, perhaps without being able to force advert banners over your page, etc. Is there a particular reason why you need to use imagestation? What do they provide you that you can't find elsewhere? Why do you need to link to images hosted by them from elsewhere?