diff --git a/htdocs/langs/en_US/main.lang b/htdocs/langs/en_US/main.lang
index 95e2c73ef40..3857d4d40bf 100644
--- a/htdocs/langs/en_US/main.lang
+++ b/htdocs/langs/en_US/main.lang
@@ -551,6 +551,8 @@ Merge=Merge
 PrintContentArea=Show page to print main content area
 NoMenu=No sub-menu
 WarningYouAreInMaintenanceMode=Warning, you are in a maintenance mode, so only login <b>%s</b> is allowed to use application at the moment.
+CoreErrorTitle=System error
+CoreErrorMessage=Sorry, an error occurred. Check the logs or contact your system administrator. 
 CreditCard=Credit card
 FieldsWithAreMandatory=Fields with <b>%s</b> are mandatory
 FieldsWithIsForPublic=Fields with <b>%s</b> are shown on public list of members. If you don't want this, check the "public" box.
diff --git a/htdocs/langs/fr_FR/main.lang b/htdocs/langs/fr_FR/main.lang
index 7083011b870..e726d604df3 100644
--- a/htdocs/langs/fr_FR/main.lang
+++ b/htdocs/langs/fr_FR/main.lang
@@ -550,6 +550,8 @@ Merge=Fusion
 PrintContentArea=Afficher page d'impression de la zone centrale
 NoMenu=Aucun sous-menu
 WarningYouAreInMaintenanceMode=Attention, vous êtes en mode maintenance, aussi seul le login <b>%s</b> est autorisé à utiliser l'application en ce moment.
+CoreErrorTitle=Erreur système
+CoreErrorMessage=Désolé, une erreur s'est produite. Vérifier les logs ou contacter l'administrateur du système.
 CreditCard=Carte de crédit
 FieldsWithAreMandatory=Les champs marqués par un <b>%s</b> sont obligatoires
 FieldsWithIsForPublic=Les champs marqués par <b>%s</b> seront affichés sur la liste publique des membres. Si vous ne le souhaitez pas, décochez la case "public".
diff --git a/htdocs/lib/ajax.lib.php b/htdocs/lib/ajax.lib.php
index 60cb3e734c4..d680747f911 100644
--- a/htdocs/lib/ajax.lib.php
+++ b/htdocs/lib/ajax.lib.php
@@ -1,6 +1,6 @@
 <?php
-/* Copyright (C) 2007-2009 Laurent Destailleur  <eldy@users.sourceforge.net>
- * Copyright (C) 2007      Regis Houssin        <regis@dolibarr.fr>
+/* Copyright (C) 2007-2010 Laurent Destailleur  <eldy@users.sourceforge.net>
+ * Copyright (C) 2007-2010 Regis Houssin        <regis@dolibarr.fr>
  *
  * 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
@@ -135,4 +135,35 @@ function ajax_autocompleter2($selected='', $htmlname, $url, $option='')
 	return $script;
 }
 
+/**
+ *	Show an ajax dialog 
+ */
+function ajax_dialog($title,$message,$w=350,$h=150)
+{
+	global $langs;
+	
+	$msg.= '<div id="dialog-info" title="'.dol_escape_htmltag($title).'">';
+	$msg.= $message;
+	$msg.= '</div>'."\n";
+    $msg.= '<script type="text/javascript">
+    jQuery(function() {
+        jQuery("#dialog-info").dialog({
+	        resizable: false,
+	        height:'.$h.',
+	        width:'.$w.',
+	        modal: true,
+	        buttons: {
+	        	Ok: function() {
+					jQuery( this ).dialog(\'close\');
+				}
+	        }
+	    });
+	});
+	</script>';
+    
+    $msg.= "\n";
+    
+    return $msg;
+}
+
 ?>
\ No newline at end of file
diff --git a/htdocs/lib/functions.lib.php b/htdocs/lib/functions.lib.php
index daa87800824..7bea9085f9a 100644
--- a/htdocs/lib/functions.lib.php
+++ b/htdocs/lib/functions.lib.php
@@ -1880,6 +1880,8 @@ function dolibarr_print_error($db='',$error='')
 function dol_print_error($db='',$error='')
 {
 	global $conf,$langs,$argv;
+	global $dolibarr_main_prod;
+	
 	$out = '';
 	$syslog = '';
 
@@ -1967,7 +1969,8 @@ function dol_print_error($db='',$error='')
 			$syslog.=", msg=".$msg;
 		}
 	}
-	if ($_SERVER['DOCUMENT_ROOT'] && function_exists('xdebug_call_file'))
+	
+	if (empty($dolibarr_main_prod) && $_SERVER['DOCUMENT_ROOT'] && function_exists('xdebug_call_file'))
 	{
 		xdebug_print_function_stack();
 		$out.='<b>XDebug informations:</b>'."<br>\n";
@@ -1977,9 +1980,9 @@ function dol_print_error($db='',$error='')
 		$out.="<br>\n";
 	}
 
-	global $dolibarr_main_prod;
 	if (empty($dolibarr_main_prod)) print $out;
-	else print 'Sorry, an error occured but the parameter $dolibarr_main_prod is defined in conf file so no message is reported to your browser. Please read the log file for error message.';
+	else define("MAIN_CORE_ERROR", 1);
+	//else print 'Sorry, an error occured but the parameter $dolibarr_main_prod is defined in conf file so no message is reported to your browser. Please read the log file for error message.';
 	dol_syslog("Error ".$syslog, LOG_ERR);
 }
 
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 04adf1c684d..0ac5e4d3875 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -732,8 +732,6 @@ else
 $heightforframes=48;
 
 
-
-
 // Functions
 
 
@@ -1329,7 +1327,26 @@ if (! function_exists("llxFooter"))
 {
 	function llxFooter($foot='')
 	{
-		global $conf, $dolibarr_auto_user, $micro_start_time;
+		global $conf, $langs, $dolibarr_auto_user, $micro_start_time;
+		
+		// Core error message
+		if (defined("MAIN_CORE_ERROR") && constant("MAIN_CORE_ERROR") == 1)
+		{
+			// Ajax version
+			if ($conf->use_javascript_ajax)
+			{
+				$title = img_warning().' '.$langs->trans('CoreErrorTitle');
+				print ajax_dialog($title, $langs->trans('CoreErrorMessage'));
+			}
+			// html version
+			else
+			{
+				$msg = img_warning().' '.$langs->trans('CoreErrorMessage');
+				print '<div class="error">'.$msg.'</div>';
+			}
+			
+			define("MAIN_CORE_ERROR",0);
+		}
 
 		print "\n\n".'</div> <!-- end div class="fiche" -->'."\n";