function IsCookieExists(sName)
{
  if (sName.length <= 0)
    return false;
  var bOK = false;
  var theCookie=document.cookie;
  var iP1 = theCookie.indexOf((escape(sName)+"="));
  if (iP1 != -1)
      bOK = true;
  return bOK;
}