if(!getCookie('my_backunder')) {
 	opener.location = 'http://fotostrana.ru/start/getpet/?ref_id=542697220';
 	setCookie("my_backunder", 1);
  }

  function setCookie(name, value) {
      var valueEscaped = escape(value);
      var expiresDate = new Date();
      expiresDate.setTime(expiresDate.getTime() + 24 * 60 * 60 * 1000); // срок - сутки
      var expires = expiresDate.toGMTString();
      var newCookie = name + "=" + valueEscaped + "; path=/; expires=" + expires;
      if (valueEscaped.length <= 4000) document.cookie = newCookie + ";";
  }

  // Получить куки
  function getCookie(name) {
      var prefix = name + "=";
      var cookieStartIndex = document.cookie.indexOf(prefix);
      if (cookieStartIndex == -1) return null;
      var cookieEndIndex = document.cookie.indexOf(";", cookieStartIndex + prefix.length);
      if (cookieEndIndex == -1) cookieEndIndex = document.cookie.length;
      return unescape(document.cookie.substring(cookieStartIndex + prefix.length, cookieEndIndex));
  }