--- print.module	2008-06-13 09:59:18.000000000 +0200
+++ print.module	2008-06-13 09:59:34.000000000 +0200
@@ -222,7 +222,9 @@ function print_fill_attributes($title = 
 
   $attributes = array();
   $attributes['title'] = $title;
-  $attributes['class'] = $class;
+  if (!empty($class)) {
+  	$attributes['class'] = $class;
+  }
 
   if ($new_window) {
     switch ($print_settings['newwindow']) {