sample works, my web no

<?php
// 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:
// $oFCKeditor->BasePath = '/fckeditor/' ;   // '/fckeditor/' is the default value.
//$sBasePath = $_SERVER['PHP_SELF'] ;
//$sBasePath = substr( $sBasePath, 0, strpos( $sBasePath, "_samples" ) ) ;
$sBasePath = '/mailing/fckeditor/';

echo "<p>".$sBasePath."</p>";

$oFCKeditor = new FCKeditor('FCKeditor1') ;
$oFCKeditor->BasePath   = $sBasePath ;
$oFCKeditor->Value      = '<p>This is some <strong>sample text</strong>. You are using <a href="http://www.fckeditor.net/">FCKeditor</a>.</p>' ;
$oFCKeditor->Create() ;
?>