title: Change picture using OpenTBS
body: <p>I saw many post about changing picture in OpenTBS but I don't understood how to do that.
  I have a .odt file wich has an image and i need to replace it from php with another one.
  From <a href="http://www.tinybutstrong.com/opentbs.php?doc#pic" rel="nofollow noreferrer">documentation</a> i see the Exemple: [ onshow.x;ope=changepic] but I have no idea where I have to put this line.
  I've also tried to use this code below but nothing happens.</p>
  
  <p>"ticket.odt" has an image (it has $PicRef descripton) which I would like to change.</p>
  
  <pre><code>$TBS= new clsTinyButStrong;
  $TBS-&gt;PlugIn(TBS_INSTALL, OPENTBS_PLUGIN);
  $TBS-&gt;LoadTemplate("Ticket/ticket.odt");
  $TBS-&gt;PlugIn(OPENTBS_CHANGE_PICTURE, $PicRef, $logo );
  </code></pre>
  
  <p>As documentation $PicRef is a string that is saved in the Title or the Description of the picture and $logo is the path for picture file that will be copied inside the document
  Could someone explain me how it'works and what i have to do?</p>