[% IF session.source %]
   <center><a href='new'>New Exercise</a></center><br>
[% END %]

[% UNLESS session.source %]
   <form enctype="multipart/form-data" method="post" action="upload">
   Source file:
   <input type="file" name="input_file" size="20">
   <input type="submit" value="Upload file!">
   [% IF session.username %]
      <br><br>
      <input type="checkbox" name="aux" value="1">Check this box if you're just uploading an auxiliary file which is not to be processed.
   [% END %]
   </form><br><br>
[% END %]

[% IF session.source %]
   <form action="update" method="post">
   <textarea  style="width:100%" 
               name="source" 
               cols="140" rows="22">[% session.source %]</textarea>
   <br>
   <input type="submit" value="Update source">
   </form>
[% END %]