var winurl="http://www.checklisten.de/other/popunder.html";
var winfeatures="width=520,height=370,scrollbars=0,resizable=0,toolbar=0,toolbars=0,popunder=1,location=0,menubar=0,status=0,directories=0,left=300,top=300";
var wintitle="Automatisch und kostenlos neue Checklisten in Ihr Postfach"
var deliver='days'; // 'session','never','ever','days'
var days=5;

function get_cookie(Name) {
  var search = Name + "="
  var returnvalue = "";
  if (document.cookie.length > 0) {
    var offset = document.cookie.indexOf(search)
    if (offset != -1) { // if cookie exists
      offset += search.length
      // set index of beginning of value
      end = document.cookie.indexOf(";", offset);
      // set index of end of cookie value
      if (end == -1)
         end = document.cookie.length;
      returnvalue=unescape(document.cookie.substring(offset, end))
      }
   }
  return returnvalue;
}

function loadornot(){
   if (get_cookie('popunder')==''){
      loadpopunder();
      if(deliver=='session'){
         cookieinfo="popunder=yes";
      }
      else if(deliver=='days') {
         ablauf = new Date();
         indays = ablauf.getTime() + (days*24*60*60*1000);
         ablauf.setTime(indays);
         cookieinfo="popunder=yes; expires=" + ablauf.toGMTString();
      }
      document.cookie=cookieinfo;
   }
}

function loadpopunder() {
   winpopunder=window.open(winurl,wintitle,winfeatures);
   winpopunder.blur();
   window.focus();
}

if(deliver=='ever') {
   loadpopunder();
}
else if(deliver=='never') {
   // do nothing
}
else {
   loadornot();
}