diff --git a/static/js/combo.public.js b/static/js/combo.public.js
index b46a351..0c115e4 100644
--- a/static/js/combo.public.js
+++ b/static/js/combo.public.js
@@ -9,12 +9,11 @@ $(function() {
     var $window = $(window);
     var offset = parseInt(Math.random()*2000);
     var $ecrans = $('.ecrans');
-    var pos = $window.scrollTop();
-    $ecrans.css('background-position', (offset + pos/2) + 'px 0px');
     $window.bind('scroll', function() {
       var pos = $window.scrollTop();
       $ecrans.css('background-position', (offset + pos/2) + 'px 0px');
     });
+    $window.trigger('scroll');
   }
   if ($('div[id|=chiffres]').length) {
     var $chiffres_section = $('div[id|=chiffres]');