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      $(document).ready(function(){
        var url = document.URL;
        var user = url.slice(url.indexOf("//") + 2, url.indexOf("."));
        var repo = url.split("/").slice(-2, -1);
        $("#pdf-link").attr("href","http://pdf.oerpub.org/" + user + "/" + repo + "/");
        $("#epub-link").attr("href","https://github.com/" + user + "/" + repo + "/archive/gh-pages.zip");
        $("#epub-folder").text(repo + "-gh-pages");
        if (user.indexOf("/") != -1) { // back-up in case it's a local URL
          $("#pdf-link, #epub-link").click(function(e){
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  <h1>Preview your book:</h1>
  
  <h2>Online</h2>
  
  <p>Alpha. Edits in the book may take up to 10 minutes to be available for preview.</p>
  <ul>
  <li>Click <a href="./reader.html">here to open the first book using epubjs reader</a>. You can include comments using Hypothes.is annotations.</li>
  <li>Click <a href="./basic-view.html">here to see a basic view of all books</a>. This viewer supports mathematics.</li>
  </ul>
  
  <h2>PDF</h2>
  <p>Check out <a id="pdf-link" href="http://pdf.oerpub.org/oerpub/sf-demo-book/">prototype PDF generation system for this book</a>. It automatically updates the PDF when any of the content of the book changes.</p>
  
  <h2>EPUB</h2>
  <p>Get an <a id="epub-link" href="https://github.com/oerpub/sf-demo-book/archive/gh-pages.zip"/>EPUB file</a> here. (Pre-alpha. Requires some technical skills.)  The books are stored in EPUB format on GitHub and you can almost just download the zip and view it with Readium (an in-browser EPUB reference implementation reader done by IDPF). If you want to give it a try, download the ZIP and make the following adjustments:
    <ul>
      <li>Unpack the book and remove the second book from <code>container.xml</code>.</li>
      <li>Rezip just the contents of the folder <code id="epub-folder">sf-demo-book-gh-pages</code>, rather than zipping the folder itself.</li>
      <li>You should now be able to view the book using the Readium Chrome extension.</li>
    </ul>
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