function getCookieValue(name) {            //Wert holen
    var value = 0;
    if(document.cookie != "") {
      var kk=document.cookie.indexOf(name+"=");
      if(kk >= 0) {
        kk=kk+name.length+1;
        var ll=document.cookie.indexOf(";", kk);
        if(ll < 0) ll=document.cookie.length;
        value=document.cookie.substring(kk, ll);
        value=unescape(value);
      }
    }
    return value;
}

function setCookieValue(name){             //Wert schreiben
    var oldValue = getCookieValue(name);
      if (oldValue == 0){
        var newValue = 1;
      }
      if (oldValue == 1){
        var newValue = 0;
      }
    document.cookie = name + "=" + escape(newValue);
}