Index: branches/5.1.x/core/editor/fckeditor.php
===================================================================
diff -u -N -r12127 -r12657
--- branches/5.1.x/core/editor/fckeditor.php	(.../fckeditor.php)	(revision 12127)
+++ branches/5.1.x/core/editor/fckeditor.php	(.../fckeditor.php)	(revision 12657)
@@ -25,7 +25,10 @@
  * strict error messages with PHP 5).
  */
 
-if ( !function_exists('version_compare') || version_compare( phpversion(), '5', '<' ) )
-	include_once( 'fckeditor_php4.php' ) ;
-else
-	include_once( 'fckeditor_php5.php' ) ;
+$fck_folder = realpath( dirname(__FILE__) );
+
+if ( !function_exists('version_compare') || version_compare( phpversion(), '5', '<' ) ) {
+	include_once( $fck_folder . DIRECTORY_SEPARATOR . 'fckeditor_php4.php' ) ;
+} else {
+	include_once( $fck_folder . DIRECTORY_SEPARATOR . 'fckeditor_php5.php' ) ;
+}