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, 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 deleteCookie (name) {
  var exp = new Date();
  exp.setTime (exp.getTime() - 1);
  // This cookie is history
  var cval = GetCookie (name);
  document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

function getExpDate(days, hours, minutes) {
  var expDate = new Date();
  if (typeof days == "number" && typeof hours == "number" && typeof minutes == "number") {
    expDate.setDate(expDate.getDate+parseInt(days));
    expDate.setHours(expDate.getHours() + parseInt(hours));
    expDate.setMinutes(expDate.getMinutes() + parseInt(minutes));
    return expDate.toGMTString();
  }
}