diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 7215acba5e7..a9e6dd51f03 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -133,6 +133,8 @@ if (isset($user->conf->MAIN_THEME) && $user->conf->MAIN_THEME)
 {
     $conf->theme=$user->conf->MAIN_THEME;
     $conf->css  = "theme/".$conf->theme."/".$conf->theme.".css";
+    // Si feuille de style en php existe
+    if (file_exists(DOL_DOCUMENT_ROOT.'/'.$conf->css.".php")) $conf->css.=".php";
 }
 if (isset($user->conf->MAIN_DISABLE_JAVASCRIPT) && $user->conf->MAIN_DISABLE_JAVASCRIPT)
 {
@@ -237,7 +239,8 @@ function top_htmlhead($head, $title="", $target="")
     print '<link rel="stylesheet" type="text/css" media="print" HREF="'.DOL_URL_ROOT.'/theme/print.css">'."\n";
 
     // Definition en alternate style sheet des feuilles de styles les plus maintenues
-    print '<link rel="alternate stylesheet" type="text/css" title="Eldy" href="'.DOL_URL_ROOT.'/theme/eldy/eldy.css">'."\n";
+    // Les navigateurs qui supportent sont rares.
+    print '<link rel="alternate stylesheet" type="text/css" title="Eldy" href="'.DOL_URL_ROOT.'/theme/eldy/eldy.css.php">'."\n";
     print '<link rel="alternate stylesheet" type="text/css" title="Freelug" href="'.DOL_URL_ROOT.'/theme/freelug/freelug.css">'."\n";
     print '<link rel="alternate stylesheet" type="text/css" title="Yellow" href="'.DOL_URL_ROOT.'/theme/yellow/yellow.css">'."\n";
 
diff --git a/htdocs/theme/eldy/eldy.css b/htdocs/theme/eldy/eldy.css.php
similarity index 99%
rename from htdocs/theme/eldy/eldy.css
rename to htdocs/theme/eldy/eldy.css.php
index eb5e563949b..7916e28e4b9 100644
--- a/htdocs/theme/eldy/eldy.css
+++ b/htdocs/theme/eldy/eldy.css.php
@@ -1,3 +1,4 @@
+<?php
 /* Copyright (C) 2004-2005 Laurent Destailleur  <eldy@users.sourceforge.net>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -18,6 +19,11 @@
  * $Source$
  */
 
+header('Content-type: text/css');
+
+require("../../conf/conf.php");
+
+?>
 
 /***** Style du fond *****/
 body {
@@ -72,7 +78,7 @@ textarea.flat
     font: 12px helvetica, verdana, arial, sans-serif;
 	font-size: 100%;
 	border: 1px solid #ccd7e0;
-	background-image : url(/theme/eldy/img/button_bg.png);
+	background-image : url(<?php echo $dolibarr_main_url_root.'/theme/eldy/img/button_bg.png' ?>);
 	background-position : bottom;
     padding: 0px 0px 0px 0px;
     margin: 0px 0px 0px 0px;