fix possible wrong separator in docuemnt root

git-svn-id: svn://svn.lighttpd.net/xcache/trunk@523 c26eb9a1-5813-0410-bd6c-c2e55f420ca7

admin/config.php.example

@@ -19,7 +19,7 @@ $free_graph_width = 120;
 function ob_filter_path_nicer($o)
 {
 	$sep = DIRECTORY_SEPARATOR;
-	$o = str_replace($_SERVER['DOCUMENT_ROOT'],  "{DOCROOT}$sep", $o);
+	$o = str_replace($_SERVER['DOCUMENT_ROOT'],  "{DOCROOT}" . (substr($d, -1) == $sep ? $sep : ""), $o);
 	$xcachedir = realpath(dirname(__FILE__) . "$sep..$sep");
 	$o = str_replace($xcachedir . $sep, "{XCache}$sep", $o);
 	if ($sep == '/') {