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srobbin/gist:1713018

Created January 31, 2012 21:26
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gistfile1.html
<noscript><img src="Koala.jpg" alt="A koala" /></noscript>
<script>
$('noscript').each(function(){
var $self = $(this)
, $img = $( $self.text() )
, src = $img.attr("src") + ( screen.width < 500 ? "?width=420" : "" );
$self.replaceWith( $img.attr("src", src) );
});
</script>
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