function setCookie(name, value, expires, path, domain, secure) 
{
  var curCookie = name + "=" + escape(value) +
      ((expires) ? "; expires=" + expires.toGMTString() : "") +
      ((path)    ? "; path="    + path                  : "") +
      ((domain)  ? "; domain="  + domain                : "") +
      ((secure)  ? "; secure"                           : "");
  document.cookie = curCookie;
}

function getCookie(name) 
{
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  }
  else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1) end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}

function delCookie(name, path, domain) 
{
  if (getCookie(name)) 
  document.cookie = name + "=" +
  (path   ? ";path="   + path   : "") +
  (domain ? ";domain=" + domain : "" ) +
  ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}