Thread:Project:Support desk/Possible to make images scale automatically depending on screen resolution?/reply

You would probably have to use JavaScript but you should be aware of the current discussion on wikitech-l about the proliferation of thumbnails.

Which begs the question: what do you mean by "scaling automatically"? Do you mean fetching a size that is just right for the user's screen (which would produce a lot of extra thumbnails) or choosing a close approximate and using the browser's scaling ability to handle the rest?