[erikvdven]

Yes, the idea is brilliant! But the purpose of my source code is to use "real-time" gif images in mail clients. Unfortunately, videlalvaro's solution is only possible for mail clients which support loading images from its original source. Google loads the images from their proxy, which downloads the images first. It DOES re-download each image at the moment you re-open the e-mail message, but it won't make it possible to manipulate the images real-time. I've tested it. It does work in clients like outlook, cause outlook shows the images from its original source, but gmail doesn't. So sending a gif image with a certain amount of frames is better, in my opinion.