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In fluid layouts it is easy to format the text to adjust nicely when the window is resized, but the images are not as fluid-friendly. This Quick Tip shows you how to swap between two image sizes based on the current size of the browser, div, or whatever you decide to make the deciding factor. For those looking for a real life example, Last.fm uses this technique on their artist pages. The technique that will be used can be expanded to cause additional changes upon resize as well, beyond simply image swapping (ie captions, navigation).