diff --git a/htdocs/install/check.php b/htdocs/install/check.php
index 4446e9e1fcb..42ce301d2de 100644
--- a/htdocs/install/check.php
+++ b/htdocs/install/check.php
@@ -30,7 +30,7 @@ $allowinstall = 0;
 $allowupgrade = 0;
 $checksok = 1;
 
-$setuplang=isset($_POST["selectlang"])?$_POST["selectlang"]:(isset($_GET["selectlang"])?$_GET["selectlang"]:$langs->getDefaultLang());
+$setuplang=GETPOST("selectlang",'',3)?GETPOST("selectlang",'',3):$langs->getDefaultLang();
 $langs->setDefaultLang($setuplang);
 
 $langs->load("install");
diff --git a/htdocs/install/etape1.php b/htdocs/install/etape1.php
index 2e494422048..2803d795fc5 100644
--- a/htdocs/install/etape1.php
+++ b/htdocs/install/etape1.php
@@ -259,8 +259,8 @@ if (! $error && $db->connected)
 
     print '<input type="hidden" name="dolibarr_main_db_character_set" value="'.$defaultCharacterSet.'">';
     print '<input type="hidden" name="dolibarr_main_db_collation" value="'.$defaultCollationConnection.'">';
-    $_POST['dolibarr_main_db_character_set']=$defaultCharacterSet;
-    $_POST['dolibarr_main_db_collation']=$defaultCollationConnection;
+    $db_character_set=$defaultCharacterSet;
+    $db_collation=$defaultCollationConnection;
 }
 
 
@@ -772,11 +772,11 @@ function write_master_file($masterfile,$main_dir)
 function write_conf_file($conffile)
 {
     global $conf,$langs;
-    global $_POST,$main_dir,$main_data_dir,$main_force_https,$main_use_alt_dir,$main_alt_dir_name,$main_db_prefix;
+    global $main_url,$main_dir,$main_data_dir,$main_force_https,$main_use_alt_dir,$main_alt_dir_name,$main_db_prefix;
     global $dolibarr_main_url_root,$dolibarr_main_document_root,$dolibarr_main_data_root,$dolibarr_main_db_host;
     global $dolibarr_main_db_port,$dolibarr_main_db_name,$dolibarr_main_db_user,$dolibarr_main_db_pass;
     global $dolibarr_main_db_type,$dolibarr_main_db_character_set,$dolibarr_main_db_collation,$dolibarr_main_authentication;
-    global $db_host,$db_port,$db_name,$db_user,$db_pass,$db_type;
+    global $db_host,$db_port,$db_name,$db_user,$db_pass,$db_type,$db_character_set,$db_collation;
     global $conffile,$conffiletoshow,$conffiletoshowshort;
     global $force_dolibarr_lib_ADODB_PATH, $force_dolibarr_lib_NUSOAP_PATH;
     global $force_dolibarr_lib_TCPDF_PATH, $force_dolibarr_lib_FPDI_PATH;
@@ -787,7 +787,7 @@ function write_conf_file($conffile)
 
     $error=0;
 
-    $key = md5(uniqid(mt_rand(),TRUE)); // Genere un hash d'un nombre aleatoire
+    $key = md5(uniqid(mt_rand(),TRUE)); // Generate random hash
 
     $fp = fopen("$conffile", "w");
     if($fp)
@@ -837,10 +837,10 @@ function write_conf_file($conffile)
 		fputs($fp, '$dolibarr_main_db_type=\''.str_replace("'","\'",($db_type)).'\';');
 		fputs($fp,"\n");
 
-		fputs($fp, '$dolibarr_main_db_character_set=\''.str_replace("'","\'",($_POST["dolibarr_main_db_character_set"])).'\';');
+		fputs($fp, '$dolibarr_main_db_character_set=\''.str_replace("'","\'",($db_character_set)).'\';');
 		fputs($fp,"\n");
 
-		fputs($fp, '$dolibarr_main_db_collation=\''.str_replace("'","\'",($_POST["dolibarr_main_db_collation"])).'\';');
+		fputs($fp, '$dolibarr_main_db_collation=\''.str_replace("'","\'",($db_collation)).'\';');
 		fputs($fp,"\n");
 
 		/* Authentication */
diff --git a/htdocs/install/etape2.php b/htdocs/install/etape2.php
index 9dfb54dbaef..34cfb29136f 100644
--- a/htdocs/install/etape2.php
+++ b/htdocs/install/etape2.php
@@ -39,7 +39,7 @@ error_reporting(0);		// Disable all errors
 error_reporting($err);
 
 $action=GETPOST('action');
-$setuplang=isset($_POST["selectlang"])?$_POST["selectlang"]:(isset($_GET["selectlang"])?$_GET["selectlang"]:'auto');
+$setuplang=(GETPOST('selectlang','',3)?GETPOST('selectlang','',3):'auto');
 $langs->setDefaultLang($setuplang);
 
 $langs->load("admin");
diff --git a/htdocs/install/etape4.php b/htdocs/install/etape4.php
index a1af8a061d2..65458ab21e7 100644
--- a/htdocs/install/etape4.php
+++ b/htdocs/install/etape4.php
@@ -30,7 +30,7 @@ require_once $dolibarr_main_document_root.'/core/class/conf.class.php';
 require_once $dolibarr_main_document_root.'/core/lib/admin.lib.php';
 
 
-$setuplang=isset($_POST["selectlang"])?$_POST["selectlang"]:(isset($_GET["selectlang"])?$_GET["selectlang"]:'auto');
+$setuplang=(GETPOST('selectlang','',3)?GETPOST('selectlang','',3):'auto');
 $langs->setDefaultLang($setuplang);
 
 $langs->load("admin");
diff --git a/htdocs/install/etape5.php b/htdocs/install/etape5.php
index f045c2a4a58..85955b67e81 100644
--- a/htdocs/install/etape5.php
+++ b/htdocs/install/etape5.php
@@ -1,6 +1,6 @@
 <?php
 /* Copyright (C) 2004		Rodolphe Quiedeville	<rodolphe@quiedeville.org>
- * Copyright (C) 2004-2011	Laurent Destailleur		<eldy@users.sourceforge.net>
+ * Copyright (C) 2004-2012	Laurent Destailleur		<eldy@users.sourceforge.net>
  * Copyright (C) 2004		Benoit Mortier			<benoit.mortier@opensides.be>
  * Copyright (C) 2004		Sebastien DiCintio		<sdicintio@ressource-toi.org>
  * Copyright (C) 2005-2012	Regis Houssin			<regis@dolibarr.fr>
diff --git a/htdocs/install/fileconf.php b/htdocs/install/fileconf.php
index 5bff4206e02..672362f86bc 100644
--- a/htdocs/install/fileconf.php
+++ b/htdocs/install/fileconf.php
@@ -30,7 +30,7 @@ include_once 'inc.php';
 
 $err=0;
 
-$setuplang=isset($_POST["selectlang"])?$_POST["selectlang"]:(isset($_GET["selectlang"])?$_GET["selectlang"]:(isset($_GET["lang"])?$_GET["lang"]:'auto'));
+$setuplang=GETPOST("selectlang",'',3)?GETPOST("selectlang",'',3):(isset($_GET["lang"])?$_GET["lang"]:'auto');
 $langs->setDefaultLang($setuplang);
 
 $langs->load("install");