<form class="button" method="get" action="<?php wl($ID)?>">                 
     <div class="no">                     
       <button type="submit" class="button">                     
         <img src="/var/www/html/dokuwiki/lib/images/fileicons/pdf.png" alt="PDF Export" />
       </button>                     
       <input type="hidden" name="do" value="export_pdf" />                    
       <input type="hidden" name="rev" value="<?php global $REV; echo $REV?>" />
       <input type="hidden" name="id" value="<?php echo $ID?>" />              
     </div>                     
   </form>