function setCookie(cookie_name, value, lasting_time) {
   var today = new Date();
   var expirydate = new Date();
   if (lasting_time == null || lasting_time == 0) {
     lasting_time = 1;
   }
   expirydate.setTime(today.getTime() + parseInt(lasting_time) * 60000);
   document.cookie = cookie_name + "=" + escape(value) + "; expires=" + expirydate.toGMTString() + " path:/index.php/";
}

function getCookie(cookie_name) {
  if (document.cookie.length > 0) {
    var cookie_start = document.cookie.indexOf(cookie_name + "=");
    if (cookie_start != -1) {
      cookie_start = cookie_start + cookie_name.length + 1;
      var cookie_end = document.cookie.indexOf(";", cookie_start);
      if (cookie_end == -1) {
        cookie_end = document.cookie.length;
      }
      return unescape(document.cookie.substring(cookie_start, cookie_end));
    }
    else {
      return null;
    }
  }
  return null;
}

function delCookie(cookie_name) {
    setCookie(cookie_name, '', -1);
}