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It is possible to dynamically set the src property of a script object. And the browsers that don’t let you do that will let you completely replace the innerHTML of a span that contains a script object with a new script object that has a new value for the src attribute. While this approach has nothing to do with standards or ideal implementations, it does work in more environments than AJAX because you don’t need a browser that supports the XMLHttpRequest object. If you’d like to see this approach in action, you can check out http://daylo.com Everything on that site that seems to use AJAX actually uses the above mentioned technique.