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copied!<p>Went away for a rest, then came back and discovered I had been testing my code by refreshing and refreshing the out-of-date copy on the server instead of the one I was editing at localhost.</p> <p>Sorry! I have been working too long.</p> <p>Here is a working version of the code:</p> <pre><code>function js_imgs() { if (document.documentElement.clientWidth <= 600) { $("img").each(function(){ if ($(this).hasClass('big')) { var oldSrc = $(this).attr('src'); var newSrc = oldSrc.substring(0, oldSrc.lastIndexOf('/')) + oldSrc.substring(oldSrc.lastIndexOf('/'), oldSrc.lastIndexOf('.')); $(this).attr('src', newSrc + '-m.' + /[^.]+$/.exec(oldSrc)); $(this).removeClass('big').addClass('mobile'); } }); } else { $("img").each(function(){ if ($(this).hasClass('mobile')) { var oldSrc = $(this).attr('src'); var newSrc = oldSrc.substring(0, oldSrc.lastIndexOf('/')) + oldSrc.substring(oldSrc.lastIndexOf('/'), oldSrc.lastIndexOf('.')); $(this).attr('src', newSrc.replace(/([^.]*)-m/, "$1") + '.' + /[^.]+$/.exec(oldSrc)); $(this).removeClass('mobile').addClass('big'); } }); } }; js_imgs(); $(window).resize(function($){ js_imgs(); }); </code></pre> <p>This is written for on-the-fly switching on window resizes, which is almost certain to be entirely unnecessary. Perhaps when switching from portrait to landscape on high-resolution iPhones or tablets, the extra code might be worthwhile; I will have to do some testing.</p> <p>Improvements and comments on the worthiness of on-the-fly switching more than welcome.</p>

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