function readID() {
  var expDays = 365; // number of days the cookie should last
  var expDate = new Date();
  expDate.setTime(expDate.getTime() +  (24 * 60 * 60 * 1000 * expDays));
  var id = GetCookie('id');
  if (id == null || id == "no id") {
    if (location.search.length > 1) id = location.search.substring(1, location.search.length);
    else id = "no id";
    if (id != GetCookie('id')) SetCookie('id', id, expDate);
  }

  // You can change the FORM location below
  // where the referral ID is stored on your page
  // You then access this element to get the ID
  document.idform.id.value = id;
}

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" : "");
}

window.onLoad=readID;