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