[pierrick@pierrick-desktop] ~/public_html/piwigo/dev/branches/2.5/plugins/ContactForm
$ svn diff main.inc.php 
Index: main.inc.php
===================================================================
--- main.inc.php        (revision 22694)
+++ main.inc.php        (working copy)
@@ -77,6 +77,11 @@
   {
     contact_form_initialize_emails();
   }
+
+  // always show a contact link in footer (but don't reveal the webmaster email)
+  if ( !is_classic_user() and !$conf['ContactForm']['cf_allow_guest'] ) return;
+  if ( !count(get_contact_emails()) ) return;
+  $template->assign('CONTACT_MAIL', true);
   
   $template->set_prefilter('tail', 'contact_form_footer_link');
 }