New answers tagged looking-for-a-script
Converting external sources to internal, may confuse search engines that crawl your site, as they will see different content when something has happened, eg: "backend is down, services are restart etc". If you only want build this mechanism, just in case that the backend is down, and you are concerned about your site rankings, I suggest that you set a 503 ...
You can achieve this effect with CSS (which is what Google are doing) without changing the image file itself. See: http://bavotasan.com/2011/circular-images-with-css3/ This will work in most browsers, but not IE8 or older. See: http://caniuse.com/border-radius
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