[Mod] Human Verification test for Advanced GuestBook 2.3.4

Hi, here is another mod to Advanced Guest Book 2.3.4 english or french.
This has only been tested on a private site.
This is beta software. Use at your own risk.
Comments and bug rapports are welcome.

################################################################# 
## MOD Title: Human Verification Test
## MOD Author: Wappendorf <wappendorf@hotmail.com>
## MOD Description: 
##		This mod is a human verification test for Advanced Guest Book 2.3.4
##		It is based on Gitme Anti Flood code from Mert (c)2005 xkare.com
##		Any other portion of this code is (c)2005 wappendorf@hotmail.com.
##		All rights reserved.
##
## MOD Version: 1.0.2
##
## Installation Level:	Easy
## Installation Time:	15 Minutes
## Files To Edit (8):
##			lang/english.php
##			lang/frensh.php
##			add_entry.php
##			lib/add.class.php
##		 	templates/form.php
##			comment.php
##			lib/comment.class.php
##		 	templates/comment.php
##			
## New File (1):	image.php
############################################################## 
## For Security Purposes, Please Check: http://proxy2.de/forum/viewtopic.php?t=5057 for the 
## latest version of this MOD. Downloading this MOD from other sites 
## could cause malicious code to enter into your guestbook.
############################################################## 
## Author Notes: 
##
## MOD Features:
##		- Generated gif image with control code needed to post an entry or comment.
##
##  /***************************************************************************
##  *
##  *   This program is free software; you can redistribute it and/or modify
##  *   it under the terms of the GNU General Public License as published by
##  *   the Free Software Foundation; either version 2 of the License, or
##  *   (at your option) any later version.
##  *
##  ***************************************************************************/
##
############################################################## 
##
## Before Adding This MOD To Your Advanced Guestbook, You Should Back Up All Files Related To This MOD 
##
##############################################################

# 
#-----[ NEW FILE image.php ]------------------------------------------ 
#

<?php
/***************************************************************************
 *
 *   Filename   		  : image.php
 *   Began			  : 2005/04/04
 *   Modified   		  : by Wappendorf 2005/10/01
 *   Copyright  		  : (c) 2005 xkare.com
 *   Version    		  : 1.0.1
 *   Written by 		  : Mert ÷–‹T in istanbul / TURKEY
 * 
 *   You are encouraged to redistribute and / or modify this program under the terms of  
 *   the GNU General Public License as published by the Free Software Foundation
 *    (www.fsf.org); any version as from version 2 of the License.
 *
 ***************************************************************************/
session_start();
function strrand($length)
{
	$str = "";
	
	while(strlen($str)<$length){
	$random=rand(48,122);
	if( ($random>47 && $random<58)  ){
	$str.=chr($random);
	} 
	
	}
		
	return $str;
}

$text = $_SESSION['ctrlstring']=strrand(5);
$img_number = imagecreate(47,17);
$backcolor = imagecolorallocate($img_number,244,244,244);
$textcolor = imagecolorallocate($img_number,0,0,0);

imagefill($img_number,0,0,$backcolor);

Imagestring($img_number,50,1,1,$text,$textcolor);

header("Cache-Control: no-cache, must-revalidate"); 
header("Content-type: image/png");
imagejpeg($img_number);
?>

# 
#-----[ OPEN ]------------------------------------------ 
#

lang/english.php