jQuery to add "Download" links to PRE and XMP elements

data.js

// Download Preformatted Sections

function makeDownloadable() {
   // Iconza by Turbolink, Creative Commons BY 3.0 Unported
   // http://www.softicons.com/free-icons/designers/turbomilk
   var png = 'data:image/png;base64,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'; 

   $('pre.data, xmp.data').each(function() {
      var data = $(this); 
      if (data.attr('data-downloadable')) { return }
      var text = data.text(); 
      if (this.tagName == 'XMP')
         text = text.replace(/^[ \t\r\n]+/, ''); 
      var alt = 'alt="Download the following preformatted code"'; 
      var a = $('<a><img src="' + png + '" ' + alt + ' title="Download"></a>'); 
      a.attr('href', 'data:text/plain,' + encodeURI(text)); 
      var p = $('<p style="float:right;margin-right:32px"></p>'); 
      p.append(a); 
      data.before(p); 
      data.attr('data-downloadable', 'true'); 
   });
}

$(makeDownloadable);