diff --git a/include/lib/html_input.class.php b/include/lib/html_input.class.php
index 1c748cb69..398f8cbc7 100755
--- a/include/lib/html_input.class.php
+++ b/include/lib/html_input.class.php
@@ -535,7 +535,7 @@ class HtmlInput
      * @param string $p_js javascript when the image is clicked
      * @param string $p_message Message 
      */
-    static  function image_click($p_image,$p_js,$p_message,$p_class)
+    static  function image_click($p_image,$p_js,$p_message,$p_class="")
     {
         $ret=sprintf('<a class="nav %s" style="display:inline" title="%s"><img src="image/%s" onclick="%s"></a>',
                 $p_class,