diff --git a/www/ttp.php b/www/ttp.php
index c484da2..57a4d08 100644
--- a/www/ttp.php
+++ b/www/ttp.php
@@ -22,7 +22,7 @@
 
 		function Header()
 		{
-			$this->Image('images/logo.png',8,8,100);
+			$this->Image($_REQUEST[bw]?'images/CAcert-logo-mono-1000.png':'images/CAcert-logo-colour-1000.png',8,8,100);
 			$this->SetFont('Arial','B',14);
 			if($_SESSION['_config']['language'] == "ja_JP")
 				$this->SetFont('SJIS','B',14);