function cre_cook(nom,contenu) {
  var expireDate = new Date();
  expireDate.setTime(expireDate.getTime() + 3*365*24*3600*1000);
  document.cookie = nom + "=" + escape(contenu) + "; expires=" + expireDate.toGMTString() + "; path=/";
  //alert(document.cookie);
}