Redirect på bg af cookie

fandt noget der virker :

var exp = new Date();
exp.setTime(exp.getTime() + (60*1000));

function getCookieVal (offset) { 
  var endstr = document.cookie.indexOf (";", offset); 
  if (endstr == -1)   
    endstr = document.cookie.length; 
  return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name) { 
  var arg = name + "="; 
  var alen = arg.length; 
  var clen = document.cookie.length; 
  var i = 0; 
  while (i < clen) {   
    var j = i + alen;   
    if (document.cookie.substring(i, j) == arg)     
      return getCookieVal (j);   
      i = document.cookie.indexOf(" ", i) + 1;   
      if (i == 0) break; 
    } 
  return null;
}

function SetCookie (name, value) { 
  var argv = SetCookie.arguments; 
  var argc = SetCookie.arguments.length; 
  var expires = (argc > 2) ? argv[2] : null; 
  var path = (argc > 3) ? argv[3] : null; 
  var domain = (argc > 4) ? argv[4] : null; 
  var secure = (argc > 5) ? argv[5] : false; 
  document.cookie = name + "=" + escape (value) +
  ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
  ((path == null) ? "" : ("; path=" + path)) + 
  ((domain == null) ? "" : ("; domain=" + domain)) +   
  ((secure == true) ? "; secure" : "");
}

function DeleteCookie (name) { 
  var exp = new Date(); 
  exp.setTime (exp.getTime() - 1); 
  var cval = GetCookie (name); 
  document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

var favorite = GetCookie('intro');

if (favorite == null) {
  SetCookie('intro', '1');
  alert('sat');
}
else {
  DeleteCookie('intro');
  alert('slettet');
  //window.location.href = 'index.php?id=1';
}