Problem (probably due to including)

<?php
include('checkrights.php');
$content.='
<script type="text/javascript" src="./fckeditor/fckeditor.js"></script><form action="sampleposteddata.asp" method="post" target="_blank">
      <script type="text/javascript">
<!--
// Automatically calculates the editor base path based on the _samples directory.
// This is usefull only for these samples. A real application should use something like this:
 oFCKeditor.BasePath = "/fckeditor/" ;

y
var oFCKeditor = new FCKeditor("FCKeditor1") ;
//oFCKeditor.BasePath   = sBasePath ;
oFCKeditor.Height   = 300 ;
oFCKeditor.Value   = "<p>This is some <strong>sample text<\/strong>. You are using <a href="http://www.fckeditor.net/">FCKeditor<\/a>.<\/p>" ;
oFCKeditor.Create() ;
//-->
      </script>

      <br />
      <input type="submit" value="Submit" />
   </form>';
include('template.php');
?>