Unable to get a cookie made with setcookie()

[Olorinx]

I'm trying to make a basic password protection scheme using cookies however when I try to set the cookie I am unable to using this code:

if($_COOKIE['RGUsername'] == NULL) {
	$query = "SELECT user, pass FROM login ";
	$query .= "WHERE user= '$Username' AND pass = '$Password'";
	$result = mysql_query($query);
	if(mysql_num_rows($result)) {
		echo("Logged in");
		$query = "UPDATE from login SET logged = SYSDATE()";
		$query .= "WHERE user = '$Username' AND pass = '$Password'";
		mysql_query($query);
		if(!isset($_COOKIE['RGUsername'])) {
		setcookie ("RGUsername", $Username, time() + 3600);
		} 
	} else {
		echo("Incorrect Login redirecting back to main page");
	}

The code i'm using to check if the cookie is registered is:

if(!isset($_COOKIE['RGUsername'])) {

include("mini_login.html");
} else {
	echo("Logged In as ");
	echo($_COOKIE['RGUsername']);
}

[Drakla]

Somewhere in the script put

echo '<pre>'; print_r($_COOKIE); echo '</pre>';

just to see if anything is in the cookie array, and post what's in there.