dan krijg ik deze melding nog

Notice: Undefined index: REQUEST_URI in D:\LocalUser\FTP-2822-admin\html\stats.php on line 281
PHP Notice: Undefined index: REQUEST_URI in D:\LocalUser\FTP-2822-admin\html\stats.php on line 276 PHP Notice: Undefined index: REQUEST_URI in D:\LocalUser\FTP-2822-admin\html\stats.php on line 281

$select = "SELECT * FROM stats_bezoekersonline WHERE ip = '".$ip."'";
$query = mysql_query($select)or die(mysql_error());

if(mysql_num_rows($query) == 0)
{
$insert = "INSERT INTO stats_bezoekersonline (datum, tijd, url , uur, ip) VALUES ('".date("Y-m-d")."', '".time()."', '".$_SERVER['REQUEST_URI']."', '".date("H:i")."','".$ip."')";
mysql_query($insert)or die(mysql_error());
}
else
{
$update = "UPDATE stats_bezoekersonline SET tijd = '".time()."', url = '".$_SERVER['REQUEST_URI']."', uur = '".date("H:i")."' WHERE ip = '".$ip."'";
mysql_query($update)or die(mysql_error());
}