Problem with my cookies

[kathrync2003]

I am writing php code that needs to find out if the user has tried to log on 3 times unsuccessfully, so I need to keep track of the # of times they tried.

I'm getting the error
------------------------------------
Notice: Use of undefined constant NumTries - assumed 'NumTries' in E:\inetpub\scripts\athlete\01_login.php on line 48

Warning: Cannot modify header information - headers already sent by (output started at E:\inetpub\scripts\athlete\01_login.php:46) in E:\inetpub\scripts\athlete\01_login.php on line 48
-------------------------------

My code doesn't work... I can't figure out what is wrong.

if(isset($_COOKIE['NumTries']))
{
$iVisits = $_COOKIE['NumTries'];

if ($iVisits < 3)
{
$iVisits = $iVisits++;
setcookie(NumTries, $iVisits);
}
}
else
{
$iVisits = 1;
setcookie(NumTries, date("F jS - g:i a"), $iVisits);
}

[NogDog]

setcookie('NumTries', $iVisits);