function createCookie(name,value,days) {
  if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i <ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}
function language(lang_on, lang_off) {
  createCookie("langue_on",lang_on,365);
  createCookie("langue_off",lang_off,365);
        for (var i=0; i<document.getElementsByTagName("div").length; i++ ) {
          if (document.getElementsByTagName("div")[i].lang == lang_on) {
                document.getElementsByTagName("div")[i].style.display="block";
          }
          if (document.getElementsByTagName("div")[i].lang == lang_off) {
                document.getElementsByTagName("div")[i].style.display="none";
          }
        }
}
function startlanguage() {
  var notdefined;
  var lang_on = readCookie("langue_on");
  var lang_off = readCookie("langue_off");
  if (lang_on == notdefined) {lang_on = "de";}
  if (lang_off == notdefined) {lang_off = "en";}
  language(lang_on,lang_off);
}
window.onload = function () {startlanguage();}